UNESCO Man and the Biosphere Programme

The UNESCO Man and the Biosphere Programme is the intergovernmental science programme that designates biosphere reserves: internationally recognized sites where biodiversity conservation coexists with sustainable human use. As of September 2025, the World Network holds 784 reserves covering more than 7.5 million km² across 142 countries, with over 200 sites containing marine or coastal components that directly intersect with international shipping routes and port operations.

The programme matters to maritime professionals because biosphere reserves can overlap with or border Particularly Sensitive Sea Areas (PSSAs), MARPOL special areas, and emission control areas. A coastal biosphere reserve does not by itself restrict ship routing, but the conservation status often precedes or accompanies IMO-level protection measures, making awareness of the designations part of prudent voyage planning.

Origins and the 1971 Launch

The intellectual foundations of the MAB Programme trace back to the 1968 Intergovernmental Conference of Experts on the Scientific Basis for Rational Use and Conservation of the Resources of the Biosphere, held in Paris. UNESCO organized the event in cooperation with the United Nations, the Food and Agriculture Organization (FAO), and the World Health Organization (WHO). The central conclusion from the 1968 conference was that conservation science and development could not be treated as separate disciplines: protecting ecosystems required understanding how human communities depended on and altered them.

UNESCO’s General Conference formally approved the MAB Programme at its 16th session in 1970, and the programme’s governing body, the International Co-ordinating Council (MAB-ICC), held its first session in 1971. That year is generally cited as the programme’s launch date, though the operational machinery of national committees and project networks took several more years to reach field scale. The biosphere reserve concept was developed by a MAB Task Force in 1974, and the first sites were added to the nascent World Network in 1976 when 57 reserves across 21 countries received designation simultaneously.

The first two decades focused on scientific research and monitoring, with each reserve acting as a field laboratory for ecology and land-use studies. The concept had a recognized limitation: many early biosphere reserves were designated over uninhabited protected areas such as national parks, with the local human population treated as a problem to manage rather than a partner in stewardship. This tension drove the major reform of the 1990s.

The Seville Strategy and Statutory Framework, 1995

UNESCO convened the International Conference on Biosphere Reserves in Seville, Spain, from March 20 to 25, 1995. Approximately 400 experts from 102 countries attended. The conference produced two instruments that still govern the network.

The Seville Strategy set the forward-looking policy direction: biosphere reserves should serve as testing grounds for sustainable development, involve local communities in governance, and demonstrate that conservation and economic development are compatible rather than opposing goals. The strategy explicitly asked that reserves be rescaled to include inhabited zones and that the transition area become a space for sustainable livelihoods, not a cordon sanitaire.

The Statutory Framework of the World Network of Biosphere Reserves, approved at Seville and adopted by UNESCO’s General Conference, established the formal rules. Article 4 sets five criteria a site must satisfy for designation. Article 5 defines the nomination and designation process. Article 9 requires a ten-year periodic review of each existing reserve. And Article 10 gives states the right to withdraw a reserve from the network, a right that 14 countries had exercised for 61 sites by 2021, mostly because the reserves lacked the resident-community component the Seville Strategy required.

The Statutory Framework is not a treaty. It functions as a soft legal instrument: biosphere reserve status is internationally recognized by UNESCO, but no binding obligations in international law attach to the designation itself. Protection of the site rests entirely on national legislation.

How Biosphere Reserves Are Zoned

Every biosphere reserve must contain three spatially distinct zones, as defined in the Statutory Framework.

Core area

The core is the innermost zone, strictly protected for biodiversity conservation with minimal human disturbance. Activities permitted include non-destructive research, passive monitoring, and traditional low-impact uses by indigenous communities where applicable. The core typically corresponds to an existing national park, nature reserve, or equivalent nationally protected area, so it carries whatever legal protection national law provides.

Buffer zone

The buffer surrounds or adjoins the core. Here, research, education, eco-tourism, and sustainable resource extraction that does not undermine core-area values are permitted. Experimental scientific management, restoration projects, and traditional fishing practices compatible with conservation objectives take place in the buffer. Shipping transit through a maritime buffer zone is not prohibited by MAB rules, but activities that degrade the ecological values of the site, such as anchoring on coral reefs or discharging pollutants, would conflict with national management plans.

Transition area

The transition area, sometimes called the cooperation zone, is the outermost ring. Communities live and work here under normal economic activities: agriculture, aquaculture, tourism, commerce, and port operations. The MAB framework asks that these activities follow sustainable development principles, but it sets no binding standards. For marine reserves, the transition area frequently encompasses shipping lanes, anchorages, and port approaches.

A single biosphere reserve can contain multiple core areas and multiple buffer zones, as long as they are functionally connected. The three-zone model is a conceptual minimum, not a rigid geometric template.

Designation Process and the Role of MAB-ICC

A state wishing to designate a biosphere reserve nominates the site through its National MAB Committee, which most UNESCO member states have established. The nomination dossier must demonstrate that the site meets the five criteria in Article 4 of the Statutory Framework: it must contain ecosystems with significant biodiversity; it must demonstrate the three-zone model; it must have governance arrangements engaging local communities; it must have monitoring and research capacity; and it must have management infrastructure.

The UNESCO MAB Secretariat reviews the dossier for completeness, then forwards it to the International Advisory Committee for Biosphere Reserves (IACBR), a 12-member scientific panel appointed by UNESCO’s Director-General. The IACBR issues a technical recommendation, which goes to the MAB-ICC for the binding designation decision.

The MAB-ICC is composed of 34 Member States, elected by UNESCO’s General Conference for four-year terms. It meets annually. Between sessions, a five-member Bureau manages the programme: one Chair and five Vice-Chairs, each representing one of UNESCO’s geopolitical regions. As of July 2024, the Chair is Latifa Yaacoubi of Morocco (Arab States), with Vice-Chairs drawn from Portugal, Slovakia, Costa Rica, the Republic of Korea, and Zambia. The 36th MAB-ICC session was held July 1 to 5, 2024 in Agadir, Morocco, where it designated 11 new biosphere reserves. The 37th session convened in Hangzhou in September 2025, designating 26 more.

Once designated, biosphere reserves undergo a ten-year periodic review examining zoning, governance, community involvement, and management effectiveness. The review can result in continued recognition, a request for remediation, or, in cases of persistent non-conformity, removal from the network.

Designation does not transfer sovereignty. The site remains under the jurisdiction of the state that nominated it, and the state retains the right to withdraw the reserve from the network by notifying the MAB Secretariat.

The World Network of Biosphere Reserves

The World Network of Biosphere Reserves (WNBR) is the operational expression of the MAB Programme. By September 2025, following the 37th MAB-ICC session in Hangzhou, the network reached 784 reserves in 142 countries. The 26 reserves designated at that session, the highest number added in a single year for two decades, brought six countries into the network for the first time: Angola, Djibouti, Equatorial Guinea, Iceland, Oman, and Tajikistan. São Tomé and Príncipe became the first state to have its entire national territory designated as a single biosphere reserve.

The combined surface area of the 784 reserves exceeds 7.5 million km², representing more than 5% of Earth’s terrestrial surface. 90% of sites overlap with Key Biodiversity Areas as mapped by IUCN, and around 50% co-occur with World Heritage Sites or Global Geoparks. Nearly 300 million people live within biosphere reserve boundaries.

Since 2018, the network has added 142 new reserves, bringing an additional 1 million km² under the biosphere reserve framework.

Regional networks

The WNBR operates through seven regional networks that coordinate training, joint research, and cross-border management:

• EuroMAB (1987): 53 countries, the largest regional network.
• AfriMAB (1996): 33 countries, focus on transboundary reserves.
• IberoMAB (1992): 25 countries across Latin America, the Caribbean, Portugal, and Spain.
• ArabMAB (1997): 36 reserves in 14 countries.
• EABRN (1994): East Asian countries including China, Japan, the Republic of Korea, and the Russian Federation.
• SeaBRnet (1998): 11 Southeast Asian countries.
• SACAM (2002): 10 countries in South and Central Asia.
• PacMAB (2006): 6 Pacific island nations.

Thematic networks

Alongside the regional structure, thematic networks link reserves sharing an ecosystem type. The most relevant to maritime affairs is the World Network of Island and Coastal Biosphere Reserves (WNICBR), covered separately below. The Mediterranean Biosphere Reserves Network (MedMaB), created in 2015, links approximately 70 reserves across 17 countries, covering a sea through which an estimated 15% of global merchant shipping passes.

The World Network of Island and Coastal Biosphere Reserves

The World Network of Island and Coastal Biosphere Reserves (WNICBR) was established in 2012 as the MAB Programme’s dedicated thematic network for marine, island, and coastal sites. Its co-secretariat is shared between two biosphere reserves: Menorca in Spain and Jeju Island in the Republic of Korea. Both were chosen because they had already built sustained research and governance programmes in their marine and coastal zones, providing organizational anchors for the wider network.

The WNICBR links 80 reserves in 30 countries. Its focus is tighter than the broader WNBR: the network specifically targets island and coastal systems that face compound pressures from climate change, ocean acidification, sea level rise, and shipping traffic. A total of 235 biosphere reserves worldwide have coastal or island components; the 80 WNICBR members are the subset that have committed to the network’s joint research and management agenda.

The 10th WNICBR meeting was held October 17 to 21, 2022, at the Wadden Sea Biosphere Reserve in Germany, with 18 representatives from 13 countries. The 11th meeting took place in September 2023 at Great Sandy Biosphere Reserve in Australia. The choice of the Wadden Sea as a meeting venue was deliberate: the German Wadden Sea sites are among the best-studied coastal biosphere reserves in the world, with continuous monitoring data reaching back four decades, and they operate inside a PSSA, making them a model for the interaction between MAB designation and IMO shipping regulation.

Two active WNICBR research programmes are directly relevant to maritime operations. The Zero Plastic working group targets the reduction of plastics and microplastics in member reserve waters, building on evidence that plastic particles make up more than 60% of waste accumulating along coastlines and in open water adjacent to island reserves. The MangRes initiative, launched September 2022, funds mangrove restoration across seven Latin American and Caribbean nations, recognizing that mangrove loss exposes coastal infrastructure, including port approaches, to higher wave energy and storm surge.

Both WNICBR programmes interact with shipping in a practical sense. Plastic pollution in coastal biosphere reserves is partly vessel-sourced under MARPOL Annex V garbage discharge rules. Mangrove loss in transit zone areas raises dredging demand as sedimentation patterns shift. Port authorities in biosphere reserve coastal areas increasingly use WNICBR monitoring data in environmental baseline assessments for berth development and channel management.

Marine and Coastal Biosphere Reserves: Named Sites

More than 200 of the 784 biosphere reserves contain significant marine or coastal components. The following are among the most relevant to maritime operations, either because of their size, their shipping overlap, or their layered designation status.

Galapagos Biosphere Reserve, Ecuador

The Galapagos Biosphere Reserve was designated in 1984 and covers 10.6 million hectares in total, of which 9.84 million hectares are marine, making the terrestrial component of the islands a relatively small fraction. The reserve simultaneously holds UNESCO World Heritage Status (inscribed 1978, marine extension 2001) and Ramsar Site designation (2001). No other site in the WNBR carries all three major international conservation designations at once.

The shipping significance is direct. The Galapagos lie at the intersection of routes between the Pacific coasts of North and South America, and large vessels have historically passed through or near island waters. Ecuador requested PSSA designation from IMO following a series of incidents, including the 2001 grounding of the Jessica tanker near San Cristóbal island, which spilled approximately 240,000 gallons of diesel and fuel oil. IMO designated the Galapagos Archipelago a PSSA in 2005 under Resolution MEPC.135(53). The associated protective measures include an Area to Be Avoided covering the most sensitive island approaches, a mandatory ship reporting system, and recommended tracks for vessels that must transit the area. Ships not calling at Galapagos ports are required to use the designated transit corridors rather than island passages. The pssa-galapagos article details the boundary coordinates and reporting requirements.

The combination of biosphere reserve, World Heritage Site, Ramsar Site, and PSSA designations creates four overlapping legal and soft-law frameworks over the same geography, each administered by a different body: UNESCO MAB-ICC, UNESCO World Heritage Committee, the Ramsar Secretariat, and IMO’s Marine Environment Protection Committee (MEPC). No formal coordination mechanism between the four exists; the Ecuadorian national authorities must maintain compliance with all four regimes independently.

Wadden Sea Biosphere Reserves, Germany

Three German biosphere reserves cover the entire German Wadden Sea: Hamburg Wadden Sea, Lower Saxony Wadden Sea, and Schleswig-Holstein Wadden Sea. In 2016, all three established a formal cooperation agreement working toward a unified reserve, though they remain separately designated. The Wadden Sea as a whole is shared with Denmark and the Netherlands under a trilateral intergovernmental cooperation framework, the Wadden Sea Secretariat, established in 1978.

The German Wadden Sea carries PSSA status, designated by IMO under Resolution MEPC.101(48) in 2002. The associated protective measures include the Mandatory Ship Reporting System WETREP (Wadden Sea Traffic Reporting System) and routing measures that define traffic separation lanes keeping large vessels in established fairways away from the intertidal flats where wading birds concentrate and grey seals breed. The PSSA boundaries run from Blaavandshuk in Denmark south along the German coast.

For port operators, the significance is concrete. The approach channels to Hamburg, Bremen, and Emden all pass through or adjacent to the biosphere reserve boundaries. Vessels calling at Hamburg via the Elbe estuary transit the Lower Saxony and Schleswig-Holstein Wadden Sea areas. Channel maintenance dredging programs for the Elbe are assessed against the biosphere reserve’s management objectives, the Wadden Sea World Heritage site conditions (the area was inscribed as a World Heritage Site in 2009, extended 2014), and MARPOL special-area discharge standards simultaneously.

The WNICBR chose the Wadden Sea as the venue for its 10th meeting in 2022 precisely because this reserve demonstrates the most developed model of multi-framework coexistence: UNESCO soft law, IMO hard regulation, World Heritage legal obligations, and national port development interests have operated in the same geographic space since 2002, and the resulting management experience provides lessons for other coastal biosphere reserves where similar layering is emerging.

Sabana-Camagüey Archipelago, Cuba

The Sabana-Camagüey Archipelago on the north coast of Cuba covers 465 kilometers of islands, cays, and coral reefs. IMO designated the area a PSSA in September 1997, making it the second PSSA ever designated globally (after Australia’s Great Barrier Reef in 1990). The Sabana-Camagüey PSSA designation was significant at the time because it established that PSSA status was not limited to wealthy nations with established IMO relationships; a developing state with a documented ecological case could obtain IMO protection for its coastal waters.

The same archipelago hosts overlapping biosphere reserve areas, including the Bay of Buena Vista Biosphere Reserve and the Caguanes National Park. The PSSA and biosphere reserve boundaries do not perfectly coincide, illustrating the typical pattern: the biosphere reserve designation covers the broader inhabited coastal landscape including fishing communities, while the PSSA focuses on the reef system and adjacent navigation channel risks. Shipping through the old Bahama Channel, which runs between the archipelago and the Cuban mainland, is governed by the PSSA’s associated protective measures, which include areas to be avoided over the reef system. The pssa-sabana-camaguey article covers the navigation rules in detail.

Sundarbans, India and Bangladesh

The Sundarbans biosphere reserves, one in India and one in Bangladesh, cover the world’s largest mangrove delta. The Indian Sundarbans Biosphere Reserve was designated in 1989 and covers 9,630 km². The Bangladesh Sundarbans was designated in 2001. Together they protect tidal waterways that serve as coastal shipping corridors for vessels approaching Kolkata (via the Hooghly River) and Mongla port in Bangladesh.

The Sundarbans present a different maritime management challenge from the Galapagos or Wadden Sea: the waterways are navigable shipping routes, not exclusion zones. Cargo vessels, river ferries, and fishing boats transit the tidal channels continuously. The mangrove forest flanks the channels at distances of a few hundred meters in places, meaning bilge pumping, anchor handling, and waste disposal practices aboard vessels transiting the Sundarbans directly affect the biosphere reserve’s buffer and core zones. Neither site carries PSSA status, so operational compliance rests on Indian and Bangladeshi national law plus MARPOL Annex I and Annex V discharge standards.

The Sundarbans also provide cyclone attenuation protection for the port infrastructure at Kolkata and Mongla. Studies cited in IUCN biodiversity assessments have documented that intact mangrove belts reduce storm surge energy by 20 to 30% at the coast; mangrove loss in the biosphere reserve’s transition zones therefore has direct port infrastructure implications.

Sian Ka’an, Mexico

The Sian Ka’an Biosphere Reserve on Mexico’s Yucatan Peninsula was designated in 1986, inscribed as a World Heritage Site in 1987, and is also a Ramsar Site. Its marine zone includes a barrier reef, tidal wetlands, and mangrove lagoons. The reserve abuts the transition shipping approaches to the Yucatan Channel, through which a significant fraction of Caribbean and Gulf of Mexico traffic passes. No PSSA covers the reserve area, but the reef system means that groundings in or near Sian Ka’an carry catastrophic ecological consequences, and the Mexican government has placed vessel traffic controls on tourist and fishing vessels within the reserve boundaries under national law.

Djibouti: Archipel des Sept Frères, 2025

Among the 26 reserves designated at the Hangzhou session in 2025, the Djibouti nomination for the Archipel des Sept Frères, Ras Siyyan, Khor Angar, and Godoria complex is notable for maritime geography. The designated area sits at the southern entrance to the Red Sea, in close proximity to the Bab-el-Mandeb strait, through which approximately 17,000 ships per year pass, carrying roughly 8% of global seaborne trade. The biosphere reserve designation does not impose any routing constraint on Bab-el-Mandeb traffic, but it flags the ecological sensitivity of a coastline that sits immediately adjacent to one of the world’s most congested and strategically important shipping chokepoints.

The Periodic Review: Process and Withdrawal Mechanism

The periodic review is the MAB Programme’s primary accountability tool. Under Article 9 of the Statutory Framework, every biosphere reserve must submit a review every ten years. The UNESCO MAB Secretariat publishes a standardized Periodic Review Form in English, French, and Spanish; states complete it against the same criteria used in the original nomination.

What the review assesses

The review form covers: the functioning of the reserve against its original designation criteria; whether the three-zone system is still appropriate and spatially adequate; the scale of the reserve relative to the ecosystem it is meant to represent; community involvement and governance arrangements, including whether resident populations are engaged; monitoring capacity, including whether baseline data and long-term datasets are maintained; management policy objectives and the means available to achieve them; implementation progress against the previous period’s commitments; and specific implementation challenges, including political, financial, or jurisdictional obstacles.

Outcomes and the remediation pathway

The MAB-ICC examines the review findings at its annual session. Three outcomes are possible. First, the council may endorse continued recognition, noting any recommendations for improvement. Second, it may issue a formal request for remediation, specifying what changes are needed and setting a timetable, typically two to three years, for the state to demonstrate compliance. Third, and most consequentially, if problems are structural and cannot be remediated, or if the state itself requests removal, the reserve is withdrawn from the WNBR. Once withdrawn, the area loses its biosphere reserve designation; the MAB Secretariat notifies the council and updates the registry.

The withdrawal record

By 2021, 14 countries had withdrawn a total of 61 biosphere reserves from the network. Three countries account for the majority:

• United States, 17 reserves: withdrawn in June 2017 at the 29th MAB-ICC session in Paris, during the Trump administration’s broader pullback from international environmental governance. The sites included Aleutian Islands, California Coast Ranges, Niwot Ridge, Noatak, Three Sisters, and twelve others. The withdrawals were not preceded by periodic review findings of non-conformity; they were a unilateral policy decision.
• Australia, 11 reserves: withdrawn between 2002 and 2020, mostly because the sites were single-use protected areas without the resident-community component the Seville Strategy requires.
• Bulgaria, 10 reserves: withdrawn between 2002 and 2021 for the same structural reason.

The US withdrawals are the most cited because they were the most politically conspicuous, but the Australian and Bulgarian withdrawals are arguably more illustrative of the programme’s design tension: sites designated in the 1970s as strict protected areas cannot be retrofitted to meet the Seville Strategy’s inhabited-landscape model without fundamental boundary changes that national authorities were unwilling to make.

The statutory framework treats withdrawal as an exceptional remedy, not a routine administrative action. The Secretariat’s guidance states that delisting “should be considered as an exception and should be applied only after careful examination, paying due respect to cultural factors.” In practice, once a state notifies the Secretariat of withdrawal, the designation lapses with no further procedure required.

Strategic Frameworks: Lima to Hangzhou

Lima Action Plan (2016-2025)

The Fourth World Congress of Biosphere Reserves, held in Lima, Peru in 2016, adopted both the MAB Strategy 2015-2025 and the Lima Action Plan (LAP). The strategy set a mission to develop and strengthen biosphere reserves as models of sustainable development, communicate lessons learned, and help Member States meet the Sustainable Development Goals (SDGs). The LAP translated that mission into four strategic action areas: maintaining and developing the WNBR as effective models; building inclusive collaboration within the MAB community; securing external partnerships and funding; and modernizing communication and data systems.

Under the LAP, the network grew from 669 reserves in 120 countries in 2016 to 784 in 142 countries by September 2025: a net addition of 115 reserves and 22 countries in nine years. The LAP emphasized ecosystem services, community well-being, and SDG alignment, and its implementation was assessed at the Fifth World Congress in 2025.

Hangzhou Strategic Action Plan (2026-2035)

The Fifth World Congress of Biosphere Reserves convened in Hangzhou, China, September 22 to 25, 2025, with more than 4,000 participants from 150 countries. It was the first World Congress held in Asia. The Congress endorsed the Hangzhou Strategic Action Plan (HSAP) 2026-2035 and the Hangzhou Declaration.

The HSAP carries three strategic objectives. First: contribute to implementation of multilateral environmental agreements and the 2030 Agenda for Sustainable Development by and beyond 2030. Second: further develop the MAB Programme and the WNBR, including both human and financial resources, and strengthen network excellence. Third: develop research and share knowledge from the WNBR to facilitate living in harmony with nature, align with the SDGs, and inspire post-2030 agreements.

The plan includes 34 voluntary action targets for Member States and other stakeholders at various levels of governance. Two targets are concrete and verifiable: by 2030, all harmful or unsustainable use of biodiversity in biosphere reserve buffer zones should be avoided; and by 2035, high-biodiversity areas in biosphere reserves should suffer no net biodiversity loss. A further goal, reflecting the network’s expansion trajectory, calls for every UNESCO Member State to have at least one biosphere reserve by 2035; as of September 2025, with 142 countries represented, around 50 UNESCO members still had no designated reserve.

The HSAP aligns the MAB Programme explicitly with the Kunming-Montreal Global Biodiversity Framework (2022), which set a global target of protecting 30% of land and ocean by 2030, and with the Paris Agreement on climate change.

Funding, Governance, and Effectiveness Challenges

The MAB Programme operates on a budget that reflects its status as one of several UNESCO science programmes competing for a fixed assessed-contributions pool. The programme’s Secretariat in Paris is small, typically fewer than 20 professional staff, and coordinates a network of 784 sites covering more than 7.5 million km². Per-site Secretariat capacity is correspondingly thin.

Funding structure

The MAB Programme draws on three sources. UNESCO’s regular programme budget, funded by Member State assessed contributions, covers Secretariat staff, ICC meeting costs, and the core programme infrastructure. Extrabudgetary voluntary contributions from Member States, bilateral aid programmes, and the private sector fund specific projects and initiatives. Selected biosphere reserves receive project grants, with individual awards reaching up to 25,000 USD per site for targeted work; this is supplementary, not operational, funding. The Michel Batisse Award for Biosphere Reserve Management (awarded biennially since 2009) recognizes best practice but carries no monetary component large enough to alter management capacity.

The 2025 World Congress discussions, as reported by the IISD Earth Negotiations Bulletin, identified access to funding as one of the two most consistently cited challenges across the network, alongside governance capacity. Delegates called for a dedicated platform to help biosphere reserves identify and access financing and resource mobilization opportunities. The HSAP acknowledges this by making “securing adequate human and financial resources” an explicit component of its second strategic objective, but the plan itself carries no mandatory funding commitments: the 34 action targets are voluntary for Member States.

Governance diversity

The governance gap between the most and least resourced biosphere reserves is wide. France’s 14 reserves, coordinated through a well-funded national committee, produce peer-reviewed research and publish monitoring data through the national environmental reporting system. Some reserves in countries with weaker national committees exist primarily on the UNESCO registry, with no active management programme and no monitoring data submitted to the MAB Secretariat. The periodic review is the mechanism intended to catch this gap, but a ten-year cycle means a poorly managed reserve can go a full decade before the review flag fires.

The US 2017 withdrawals removed 17 sites from the WNBR and simultaneously ended the US national MAB committee’s operational engagement with the network, reducing the resources available for North American transboundary reserve coordination. The United States rejoined UNESCO in 2023, and discussions about re-nominating former sites are ongoing, but no nominations had been submitted to the MAB Secretariat by the time of the Hangzhou congress.

Effectiveness debate

The fundamental effectiveness question about biosphere reserves is whether UNESCO designation, absent binding legal force, changes ecological outcomes at the site level. Research on this question is mixed. A 2024 study in PMC (National Institutes of Health) examining the Cape Winelands Biosphere Reserve in South Africa found that implementation of MAB Programme requirements depended heavily on perceived government support and local stakeholder awareness, with limited resources for project implementation identified as the dominant constraint. Similar findings from other sites suggest that biosphere reserve status is most effective where national law already provides strong protection and least effective where the designation is not backed by national conservation legislation.

For shipping operations, this effectiveness debate has a practical corollary: a biosphere reserve designation alone does not guarantee that discharge, ballast water, or anchor-damage violations in a buffer or core zone will be prosecuted. Enforcement rests on national port state jurisdiction and on whether MARPOL special area rules apply in the same geography.

Relationship to Other International Conservation Designations

The MAB Programme shares the UNESCO institutional umbrella with the World Heritage Convention but the two systems are distinct in purpose, legal weight, and process.

Biosphere reserves compared to World Heritage Sites

A World Heritage Site is inscribed under the 1972 Convention Concerning the Protection of the World Cultural and Natural Heritage by the World Heritage Committee, a body of 21 UNESCO Member States. Inscription requires a demonstration of Outstanding Universal Value against one or more of ten criteria. The World Heritage Convention creates binding obligations on states parties to protect inscribed sites, though enforcement relies on compliance and diplomatic pressure rather than sanctions.

A biosphere reserve requires no demonstration of outstanding universal value: the criteria are functional (does the site demonstrate sustainable development?) rather than comparative. Biosphere reserve status is granted by the MAB-ICC under a soft-law framework, not a treaty. The designation can be withdrawn voluntarily, and there is no World Heritage equivalent of the MAB periodic review that checks functional performance against benchmarks every ten years.

About 50% of biosphere reserves overlap geographically with World Heritage Sites. The Galapagos, Sundarbans, and Doñana (Spain) all carry both designations. But holding one designation does not automatically qualify for the other, and the review criteria are applied independently by separate bodies.

Biosphere reserves compared to Ramsar Sites

The Ramsar Convention on Wetlands, signed in Ramsar, Iran in 1971 and entered into force in 1975, designates wetlands of international importance. Ramsar Sites focus specifically on wetland ecosystems and carry a “wise use” obligation under Article 3 of the Convention. As of early 2025, there are 2,494 Ramsar Sites covering 256 million hectares. Many coastal biosphere reserves overlap with Ramsar Sites because mangroves, tidal flats, and estuaries are both wetlands and high-priority biosphere-reserve habitats. The Sian Ka’an reserve is a Ramsar Site; so is the Galapagos. But the Ramsar designation governs wetland management specifically, while the biosphere reserve designation frames a broader inhabited landscape model.

Biosphere reserves and PSSAs

Particularly Sensitive Sea Areas are designated by IMO under Resolution A.927(22) and associated guidelines. A PSSA must have one or more recognized attributes: ecological, social, economic, cultural, or scientific significance, and vulnerability to damage from shipping. IMO then adopts associated protective measures, which can include ship routing, mandatory pilotage, areas to be avoided, or discharge bans.

As of 2024, 19 PSSAs exist globally. Several overlap with or adjoin biosphere reserves:

• The Galapagos Archipelago PSSA (2005, MEPC.135(53)) and the Galapagos Biosphere Reserve (1984) share the same geography. Associated protective measures include an Area to Be Avoided, a mandatory ship reporting system, and recommended transit tracks.
• The Wadden Sea PSSA (2002, MEPC.101(48)) and the three German Wadden Sea biosphere reserves are congruent. The mandatory WETREP reporting system and traffic separation routing govern commercial traffic in the approach channels to Hamburg, Bremen, and Emden.
• The Sabana-Camagüey Archipelago PSSA (Cuba, 1997) coincides with overlapping biosphere reserve areas. It was the second PSSA ever designated globally, and its adoption established the precedent that developing states could obtain IMO protection for ecologically sensitive coastal waters.
• The Great Barrier Reef PSSA (Australia, first designated 1990) covers waters adjacent to the Great Barrier Reef World Heritage Area. Australia’s 2015 PSSA extension added the Coral Sea. Some of the Reef’s designated buffer zone geography has historically carried biosphere reserve consideration.
• The Papahānaumokuākea Marine National Monument PSSA (United States, 2007) in the Northwestern Hawaiian Islands shares its geography with a biosphere reserve designation, making it one of the few US marine sites to carry both frameworks.

The legal mechanism is entirely different across the two systems. A PSSA confers IMO-recognized shipping controls enforceable under flag-state and port-state jurisdiction. A biosphere reserve confers UNESCO recognition and national management obligations. A master’s decision about route selection in a marine biosphere reserve area is governed by the PSSA associated protective measures (if any), by MARPOL special area provisions, and by SOLAS Chapter V routing requirements: not by the MAB designation itself.

For voyage planning in areas that include both designations, the pssa-overview article covers the IMO designation criteria, application process, and navigational obligations in detail. The emission-control-areas article covers the MARPOL Annex VI regulatory layer. The ramsar-convention article covers the wetland regime that frequently applies in the same coastal geography.

Summary comparison

The MAB Programme and Global Biodiversity Targets

The Hangzhou Strategic Action Plan positions the network as a delivery mechanism for the Kunming-Montreal Global Biodiversity Framework (KM-GBF), adopted at COP15 in December 2022. The KM-GBF’s Target 3, the 30x30 commitment, calls for at least 30% of Earth’s land and ocean areas to be effectively conserved or protected by 2030. The 784 biosphere reserves cover more than 5% of Earth’s terrestrial surface today, and their marine components contribute to ocean coverage, though biosphere reserves alone cannot reach the 30% threshold.

The MAB Programme contributes to Target 3 in two ways. Core areas of biosphere reserves qualify directly as protected areas for 30x30 accounting purposes under national reporting. The broader transition areas can be counted as Other Effective Area-based Conservation Measures (OECMs) under the KM-GBF, if they demonstrably deliver biodiversity conservation outcomes alongside sustainable use. This OECM pathway is important for shipping: a managed shipping lane through a biosphere reserve transition area with appropriate routing, discharge controls, and pollution response capacity could in principle be reported as an OECM contributing to national 30x30 commitments, though the specific accounting methodologies remain under development at IUCN and CBD.

The Paris Agreement’s 1.5°C pathway and the MAB Programme connect through carbon storage in biosphere reserve ecosystems: mangrove forests, peatlands, and seagrass meadows in coastal reserves represent some of the highest-density carbon stores per hectare on Earth. The green-shipping-corridors article covers the shipping sector’s specific contributions to climate commitments in maritime corridors.

Governance at National Level

Most UNESCO member states have established a National MAB Committee, an expert body that coordinates the country’s biosphere reserve nominations, manages national networks, and reports to the MAB-ICC. National committees vary enormously in capacity. France’s national committee has coordinated 14 biosphere reserves since the programme’s early years and publishes research across all its sites. Some newer member states have committees that exist primarily on paper.

The national committee is the first port of call for port authorities, shipping companies, or developers seeking to understand how a biosphere reserve designation affects coastal development or port expansion plans. The UNESCO MAB Secretariat in Paris does not intervene in national planning decisions; its role is to provide guidance documents, maintain the international registry, and manage the periodic review process. If a port expansion project threatens to degrade a core or buffer zone of a biosphere reserve to the point where the site can no longer meet the designation criteria, the MAB Secretariat can flag the issue in the periodic review, but enforcement rests with national authorities.

Marine Research and Monitoring in Biosphere Reserves

Biosphere reserves are explicitly designated as sites for long-term ecological research and monitoring, functions that provide data relevant to maritime operations. The MAB Programme’s Earth Network (formerly GLOBE, restructured 2022) connects biosphere reserve sites with international climate and environmental monitoring databases.

Marine biosphere reserves contribute data to the Global Ocean Observing System (GOOS) through water quality monitoring, biodiversity surveys, and sediment transport studies. The Wadden Sea reserves, for example, contribute four decades of tidal-flat ecology data that inform dredging management for the approach channels to Hamburg and Bremen. The Sundarbans reserves contribute cyclone-barrier studies that affect port infrastructure planning along the northeastern Bay of Bengal coast.

The World Network of Island and Coastal Biosphere Reserves runs a Zero Plastic working group and a MangRes mangrove restoration initiative, both of which intersect with shipping-related pollution pathways and coastal infrastructure resilience. Research priorities across WNICBR member reserves include the effects of ballast water discharge on coastal biodiversity, underwater acoustic noise from vessel traffic on marine mammal populations using buffer zones, and anchor-drag damage to seagrass meadows in transition and buffer zone shallows.

Limitations of the Biosphere Reserve Designation

The MAB Programme’s lack of binding legal force is both its political strength and its practical weakness.

Because biosphere reserve designation imposes no treaty obligation, states have been willing to nominate large, inhabited areas including port cities, industrial waterfronts, and active fishing grounds that would never qualify under the stricter outstanding-universal-value standard of the World Heritage Convention. This flexibility has enabled the network to grow to 784 sites. The reserve around the Rhine delta in the Netherlands includes the Port of Rotterdam’s hinterland. The biosphere reserve concept can accommodate this because its purpose is to demonstrate sustainable development, not to exclude human use.

The consequence is that protection is only as strong as national law and political will. Where national authorities treat the designation as a reputational asset with minimal management obligations, it delivers little conservation gain. The ten-year periodic review is the main accountability mechanism, but the MAB Secretariat lacks enforcement authority. A review finding that a reserve has failed to maintain its core-area integrity can result only in a recommendation for remediation or, ultimately, withdrawal from the network. Sixty-one reserves had been withdrawn by 2021, a figure that reflects both the seriousness of the review process and the limits of its enforcement reach.

For shipping operations, the absence of binding legal force means that navigating through a marine biosphere reserve transition area triggers no mandatory reporting or routing obligations beyond those imposed by SOLAS, MARPOL, and any applicable PSSA associated protective measures. The biosphere reserve status may be factored into environmental impact assessments for port development, new berth construction, or channel deepening, but it does not by itself create a maritime exclusion zone or a speed restriction.

A second limitation is jurisdictional: the MAB Programme has no mechanism to designate biosphere reserves in areas beyond national jurisdiction (ABNJ). The emerging High Seas Treaty (formally the Agreement under the United Nations Convention on the Law of the Sea on the Conservation and Sustainable Use of Marine Biological Diversity of Areas Beyond National Jurisdiction, adopted in 2023) creates a framework for area-based management tools on the high seas, but biosphere reserves are not listed as a qualifying instrument under that treaty.

Third, transboundary biosphere reserves, which straddle international frontiers, require bilateral or multilateral cooperation that can be disrupted by political relations between the states involved. The Wadden Sea biosphere reserves in Germany and the Netherlands cooperate effectively through the Wadden Sea Secretariat established under a separate trilateral intergovernmental process; other transboundary reserves have struggled with asymmetric national-level commitment.

Biosphere Reserves and the Antarctic Treaty System

One deliberate gap in the WNBR is Antarctica. The continent is covered by the Antarctic Treaty System, including the Protocol on Environmental Protection to the Antarctic Treaty (Madrid Protocol, 1991), and UNESCO does not operate the MAB Programme there. Antarctic conservation and the conduct of vessels operating in the Southern Ocean are instead governed through the antarctic-treaty-1959 framework and the associated rules on ship routing in ice-covered waters under the Polar Code (IMO MEPC.264(68) and MSC.385(94)).

Practical Notes for Maritime Professionals

Ship operators, port planners, and environmental compliance teams should note several practical implications of biosphere reserve geography.

Voyage planning: Electronic chart systems and route-planning software do not automatically flag biosphere reserve boundaries the way they flag PSSA or special area boundaries. Masters planning transits through coastal areas should cross-check the WNBR database (available at UNESCO.org) against the route to identify whether the transit area falls within a buffer or core zone, then check whether the same area carries PSSA or MARPOL special-area status. The absence of IMO-level designation does not mean the area is unregulated: national laws protecting the biosphere reserve’s core and buffer zones may impose discharge prohibitions, speed restrictions on wildlife disturbance grounds, or anchoring bans enforced under national port-state jurisdiction.

Port development environmental impact assessment: Any project that could physically affect a biosphere reserve, including channel deepening, new berth construction, breakwater extension, or dredge-material disposal, will typically trigger an environmental impact assessment under national law. The biosphere reserve designation is a material factor in that assessment. For sites that also carry World Heritage or Ramsar status, a separate assessment may be required under those regimes.

Flag-state and port-state control: Port-state control officers do not currently inspect for biosphere-reserve-related compliance as a category, but they do inspect for MARPOL Annex V (garbage), Annex I (oil), and Annex IV (sewage) compliance in special areas. Several marine biosphere reserves fall within MARPOL special areas, so the operational discharge standards are stricter there regardless of the biosphere reserve designation. The marpol-annex-v article covers the garbage discharge rules in special areas.

Environmental management plans: Companies operating regular services through marine biosphere reserves, particularly ferry operators, cruise lines, and offshore support vessel operators with repeated transits, should consider whether their environmental management systems specifically address the biosphere reserve context. Some port state memoranda of understanding and individual port-state authorities expect vessels calling at ports within or adjacent to biosphere reserves to demonstrate that their ballast water management, sewage treatment, and garbage handling comply with the most restrictive applicable standard, even when a MARPOL special-area rule does not technically apply.

See also

• pssa-overview: IMO criteria, designation process, and navigational implications of Particularly Sensitive Sea Areas
• pssa-galapagos: The Galapagos Archipelago PSSA and its associated protective measures
• pssa-sabana-camaguey: Cuba’s Sabana-Camagüey PSSA, the world’s second designated PSSA
• ramsar-convention: The 1971 wetlands treaty and its obligations on shipping in designated sites
• emission-control-areas: MARPOL Annex VI ECAs, which frequently overlap with sensitive coastal and marine areas
• green-shipping-corridors: Designated maritime routes designed to reduce emissions in sensitive areas
• antarctic-treaty-1959: The treaty system governing the one region the MAB Programme does not reach
• marpol-annex-v: Garbage discharge rules, including special area prohibitions relevant to marine biosphere reserves