UNEP Regional Seas Programme: Conventions and Scope

The UNEP Regional Seas Programme is the world’s largest regional ocean governance system, covering 18 seas and involving 146 coastal states through a combination of binding conventions, protocols, and coordinated action plans. Launched in 1974 in direct response to the 1972 Stockholm Conference, it establishes the legal and scientific infrastructure for protecting shared marine environments where coastal states lack the capacity or incentive to act individually.

The programme’s core logic is straightforward: pollution, fisheries collapse, and habitat loss in semi-enclosed or shared seas cannot be solved unilaterally. The Mediterranean state that reduces sewage discharge still receives the runoff from its neighbors. The West African state that protects mangroves still sees its fish stocks depleted by fleets operating in shared waters beyond its own jurisdiction. Regional Seas programmes exist to close those gaps by giving neighboring states a common legal floor, a shared monitoring network, and a joint secretariat to coordinate action.

What makes the programme unusual in international environmental law is its structural flexibility. Some programmes are administered and funded directly by UNEP. Others are managed by non-UNEP partner bodies but sit under the Regional Seas umbrella. A third group operates entirely independently but participates in the global coordination architecture. All 18 programmes connect into the same overarching governance cycle: the Global Meetings of the Regional Seas Conventions and Action Plans, which convene every two years and in June 2025 endorsed the 2026-2029 Regional Seas Strategic Directions.

Origins: Stockholm 1972 to Nairobi 1974

The political impetus for the Regional Seas Programme came from Recommendation 92 of the 1972 United Nations Conference on the Human Environment in Stockholm. The conference produced the first global recognition that ocean pollution was a threat requiring coordinated international response, and it created UNEP as the body tasked with acting on that recognition. UNEP’s Governing Council moved quickly: by 1974 the Regional Seas Programme was established with a mandate to work through region-specific frameworks rather than a single global convention.

That choice of regional rather than global architecture was deliberate. UNEP’s leadership concluded that the political, ecological, and oceanographic differences between the Baltic Sea and the South Pacific were too large for a single treaty to address meaningfully. A Baltic state facing nitrogen runoff from agriculture and a Pacific island state facing coral bleaching needed different monitoring tools, different legal instruments, and different technical assistance. The regional model let each framework be shaped by the states that shared the sea in question.

The Mediterranean was the proving ground. The first Regional Seas convention, the Barcelona Convention for the Protection of the Mediterranean Sea Against Pollution, opened for signature in February 1976 and entered into force in February 1978. The Mediterranean Action Plan (MAP), adopted at the same meeting, gave it an operational structure. The Barcelona model: a framework convention, legally binding protocols on specific pollution sources, a secretariat in Athens, and a biennial Conference of the Parties, became the template every subsequent Regional Seas programme adapted.

By 1982, the Kuwait (1978), Abidjan (1981), Lima (1981), Cartagena (1983), and Jeddah (1982) conventions had all been adopted. Within a decade of Stockholm, more than half of the world’s major semi-enclosed seas had binding regional protection instruments.

The Three Administrative Categories

The 18 Regional Seas programmes fall into three administrative categories. The distinction affects funding, secretariat structure, and the degree of UNEP’s direct operational involvement, but all three categories sit within the same global coordination framework.

UNEP-administered programmes have their regional coordinating units (RCUs) funded through the UNEP Environment Fund and staffed by UNEP personnel. They are, in institutional terms, part of UNEP itself. The seven UNEP-administered programmes are: the Mediterranean Action Plan (Barcelona Convention), the West and Central Africa programme (Abidjan Convention), the East African programme (Nairobi Convention), the Wider Caribbean programme (Cartagena Convention), the ROPME Sea Area programme (Kuwait Convention), the East Asian Seas programme (COBSEA), the Northwest Pacific programme (NOWPAP), and the Caspian Sea programme (Tehran Convention).

Non-UNEP-administered (partner) programmes operate under their own governance and funding structures but are recognized as part of the Regional Seas family and participate in the Global Meetings. Their secretariats are not part of UNEP but coordinate with it. The non-UNEP-administered programmes include the Antigua Convention (North-East Pacific), the Bucharest Convention (Black Sea), the Jeddah Convention (Red Sea and Gulf of Aden, administered by PERSGA), the Lima Convention (South-East Pacific, administered by CPPS), the South Asian Seas programme (administered by SACEP), and the SPREP Noumea Convention (Pacific).

Independent programmes have full governance autonomy and their own treaty bodies, but participate in Regional Seas global meetings and are formally recognized as partners. The four independent programmes are: the Helsinki Convention (HELCOM, Baltic Sea), the OSPAR Convention (North-East Atlantic), the Protection of the Arctic Marine Environment programme (PAME), and the Convention for the Conservation of Antarctic Marine Living Resources (CCAMLR).

The distinction between “non-UNEP-administered” and “independent” is partly one of historical relationship. HELCOM and OSPAR pre-date the current Regional Seas architecture in important ways: the original Helsinki Convention was signed in 1974, the same year the Regional Seas Programme was established, while OSPAR consolidated two earlier North Atlantic conventions in 1992. Both are mature institutions with their own Commissions, scientific working groups, and enforcement cultures.

The Convention-Plus-Action-Plan Model

Every Regional Seas programme operates through two interlocking instruments: a framework convention and an action plan.

The framework convention establishes the legal obligations. It defines the geographical scope of the programme, the general duty to prevent and control pollution, the obligation to cooperate, the mechanism for adopting protocols, and the institutional structure (secretariat, Conference of the Parties, scientific advisory body). Framework conventions are intentionally broad: they commit states to a direction without prescribing every specific standard, leaving precision to the protocols.

Protocols are where the specific standards live. Each protocol addresses a distinct pollution vector or conservation objective. A typical Regional Seas programme will have protocols covering: dumping from ships and aircraft; pollution from land-based sources and activities; emergency response to pollution incidents; specially protected areas and biodiversity; and in some regions, offshore hydrocarbon exploration. Protocols go through their own ratification processes, so a state can be party to the framework convention without ratifying every protocol, though the framework convention usually requires parties to work toward joining the protocols.

Action plans sit alongside the legal instruments. They are not treaties and do not create binding legal obligations, but they provide the operational program: the monitoring and assessment activities, the technical assistance priorities, the institutional coordination, and the capacity-building agenda. Action plans are updated by the Conference of the Parties, giving each programme the flexibility to shift focus as conditions change without reopening the treaty.

The interaction between convention and action plan matters for maritime shipping because it’s how regional science feeds into policy. The monitoring networks established under action plans generate the data that supports MARPOL special area designations and IMO Particularly Sensitive Sea Area (PSSA) applications. The PSSA overview explains how PSSAs are formally designated by IMO; what the Regional Seas programmes provide is the ecological and monitoring basis that a PSSA application must demonstrate.

Regional Survey: The Eighteen Programmes

The table below lists all 18 programmes with their primary legal instrument, adoption year, administering body, and number of contracting parties or participating states where confirmed.

Mediterranean: The Barcelona Convention and Seven Protocols

The Barcelona Convention of 1976 is the oldest and institutionally deepest of all Regional Seas frameworks. Originally titled the Convention for the Protection of the Mediterranean Sea Against Pollution, it was revised in 1995 to the Convention for the Protection of the Marine Environment and the Coastal Region of the Mediterranean, reflecting a shift from a purely pollution-control mandate to a broader ecosystem and coastal zone scope.

The Mediterranean Action Plan (MAP), its operational companion, coordinates 21 contracting parties: the 21 coastal states of the Mediterranean basin plus the European Union. The Barcelona Convention’s seven protocols address the full spectrum of marine threats:

The Dumping Protocol (1976) bans or strictly controls the dumping of substances from ships and aircraft. It was among the first regional instruments to codify the prohibition on dumping certain hazardous materials that MARPOL 73/78 was simultaneously codifying at the global level.

The Emergency Protocol, first adopted in 1976 and replaced by a revised protocol in 2002, governs cooperation in preventing and combating pollution emergencies, including oil spills from ships. Its 2002 revision expanded coverage to hazardous and noxious substances (HNS) spills.

The Land-Based Sources Protocol (1980, revised 1996 as the LBS Protocol) addresses runoff, discharges, and atmospheric deposition from coastal and riverine sources, which account for the majority of marine pollution in semi-enclosed seas like the Mediterranean.

The Specially Protected Areas and Biological Diversity Protocol (SPA/BD Protocol), adopted in 1982 and replaced in 1995, establishes the framework for Mediterranean Specially Protected Areas (SPAs) and the Specially Protected Areas of Mediterranean Importance (SPAMIs) list. SPAMIs can extend into international waters beyond national jurisdiction, making this protocol an early example of high-seas area-based management.

The Offshore Protocol (1994) regulates pollution from hydrocarbon exploration and exploitation. It covers drilling operations, produced water discharges, and platform decommissioning. The Mediterranean hosts active offshore drilling in Libyan, Algerian, Italian, and Adriatic waters where this protocol applies.

The Hazardous Wastes Protocol (1996) controls transboundary movements of hazardous wastes between contracting parties, complementing the Basel Convention at the regional level.

The Integrated Coastal Zone Management Protocol (ICZM Protocol, 2008) is the most recent addition and the only internationally binding instrument to apply ICZM principles across an entire sea basin. It entered into force in 2011 after ratification by a sufficient number of parties.

The Mediterranean is also a MARPOL Annex I, II, and V special area. Ships operating in Mediterranean waters face stricter oil and garbage discharge restrictions than on the open ocean. The MARPOL Annex I framework designates the Mediterranean as a special area prohibiting any oil discharge from ships of 400 GT or above.

West and Central Africa: The Abidjan Convention

The Abidjan Convention of 1981 covers the Atlantic coastline from Mauritania in the north to Namibia in the south, a region of 22 states sharing the Guinea Current large marine ecosystem. Its full name is the Convention for Co-operation in the Protection and Development of the Marine and Coastal Environment of the West and Central African Region.

The convention is UNEP-administered from Abidjan, Ivory Coast. It has two protocols: the Protocol Concerning Co-operation in Combating Pollution in Cases of Emergency, covering oil spill response, and the Protocol Concerning Specially Protected Areas and Wild Fauna and Flora (adopted 2008 but not yet in force as of 2025). The West and Central Africa region faces acute pressure from offshore oil production: the Gulf of Guinea hosts major producing states including Nigeria, Angola, Ghana, Cameroon, and Equatorial Guinea, and shipping traffic including oil tanker exports runs through waters covered by the Abidjan regime.

A persistent capacity challenge in the Abidjan Convention is the disparity between the states with the largest offshore hydrocarbon industries and the states with the weakest environmental enforcement. This is a documented structural problem in the programme’s evaluation literature, not a failure specific to any administration.

Eastern Africa: The Nairobi Convention

The Nairobi Convention of 1985 covers the Indian Ocean coastline from Pakistan in the north to South Africa’s border with Mozambique, encompassing the Eastern African region including the island states of Comoros, Madagascar, Mauritius, Mozambique, and Seychelles. Its full name is the Convention for the Protection, Management and Development of the Marine and Coastal Environment of the East African Region.

Adopted in 1985 and entering into force in 1996, it has two active protocols: the Protocol Concerning Protected Areas and Wild Fauna and Flora, and the Protocol Concerning Co-operation in Combating Marine Pollution in Cases of Emergency. A third protocol, the Protocol for the Protection of the Marine and Coastal Environment of the Western Indian Ocean from Land-based Sources and Activities, was adopted in 2010. The Nairobi secretariat operates from UNEP headquarters in Nairobi, Kenya.

The Nairobi Convention region is ecologically distinctive: it encompasses the Coral Triangle fringe in the northwest Indian Ocean, the Aldabra and Chagos reef complexes, the mangrove coasts of Kenya and Tanzania, and the seasonal upwelling systems off Somalia and Arabia. Ship traffic crossing this region includes the Persian Gulf-Europe oil tanker routes transiting through the Gulf of Aden and around the Cape of Good Hope.

Wider Caribbean: The Cartagena Convention

The Cartagena Convention of 1983 and the Wider Caribbean region it governs span the Caribbean Sea, the Gulf of Mexico, and the northern coast of South America, covering some 28 states and territories. The convention’s formal title is the Convention for the Protection and Development of the Marine Environment of the Wider Caribbean Region.

It entered into force in 1986 and is administered by UNEP’s Caribbean Environment Programme (CEP) in Kingston, Jamaica. Three protocols are in force: the Oil Spills Protocol (Protocol Concerning Co-operation in Combating Oil Spills in the Wider Caribbean Region, 1983), the Specially Protected Areas and Wildlife Protocol (SPAW Protocol, 1990), and the Land-Based Sources Protocol (LBS Protocol, 1999). The SPAW Protocol establishes a regional list of threatened species and habitats requiring protection, binding all parties to apply common management standards.

The Wider Caribbean is a MARPOL Annex V special area for garbage, meaning ships operating in Caribbean waters cannot discharge garbage, including food waste, into the sea except under strict conditions. The Caribbean Environment Programme also coordinates the region’s response to the BBNJ Agreement’s provisions on environmental impact assessments for high-seas activities.

ROPME Sea Area: The Kuwait Convention

The Kuwait Convention of 1978 covers the Persian Gulf, the Gulf of Oman, and the Gulf of Aden coast, a sea area formally called the ROPME Sea Area after the Regional Organization for the Protection of the Marine Environment. It was the first Regional Seas convention adopted after Barcelona, signed in Kuwait City on 24 April 1978 by Bahrain, Iran, Iraq, Kuwait, Oman, Qatar, Saudi Arabia, and the United Arab Emirates.

The ROPME Sea Area is one of the most heavily trafficked oil transit corridors in the world: more than 20% of global oil trade passes through the Strait of Hormuz. ROPME’s protocols include the Protocol Concerning Regional Co-operation in Combating Pollution by Oil and Other Harmful Substances in Cases of Emergency (1978) and the Protocol Concerning Marine Pollution Resulting from Exploration and Exploitation of the Continental Shelf (1989).

The Gulf is a MARPOL Annex I and V special area, and the area from the Gulf to the Red Sea through the Gulf of Aden falls under the combined coverage of the Kuwait Convention and the Jeddah Convention. The ecological sensitivity of the Gulf, which is shallow, hypersaline, and subject to extreme temperature ranges, makes it one of the most acute cases for the argument that regional seas standards must exceed global MARPOL minimums.

Red Sea and Gulf of Aden: The Jeddah Convention

The Jeddah Convention of 1982, formally the Regional Convention for the Conservation of the Red Sea and Gulf of Aden Environment, was signed in Jeddah in February 1982. Its parties are Djibouti, Egypt, Jordan, Saudi Arabia, Somalia, Sudan, and Yemen. The Programme for the Environment of the Red Sea and Gulf of Aden (PERSGA), based in Jeddah, serves as its secretariat.

The Red Sea is the world’s most saline major body of water after the Dead Sea, with near-zero freshwater input and restricted exchange with the Indian Ocean through the Bab-el-Mandeb Strait. Its coral reefs, including those of Egypt’s Sinai Peninsula and Saudi Arabia’s Farasan Islands, are among the most thermally tolerant in the world and constitute a disproportionately important reservoir of reef biodiversity. Suez Canal transit traffic makes the Red Sea one of the world’s highest-density shipping corridors.

South-East Pacific: The Lima Convention

The Lima Convention of 1981, formally the Convention for the Protection of the Marine Environment and Coastal Area of the South-east Pacific, covers the Pacific coasts of Colombia, Chile, Ecuador, Panama, and Peru. It is administered by the Permanent Commission of the South Pacific (CPPS), headquartered in Guayaquil, Ecuador.

The Lima Convention region is distinguished by the Humboldt Current, one of the world’s most productive upwelling systems and the basis of the Eastern Pacific anchovy fishery. Its protocols cover emergency oil spill response (1981), protection of the marine environment from land-based sources (1983), specially protected areas (1989), and radioactive contamination (1989). The South-East Pacific is a MARPOL Annex I special area.

Caspian Sea: The Tehran Convention

The Tehran Convention of 2003, formally the Framework Convention for the Protection of the Marine Environment of the Caspian Sea, was the first Regional Seas convention signed after the post-Soviet reorganization of Central Asia. Adopted in Tehran on 4 November 2003 and entering into force on 12 August 2006, its five parties are Azerbaijan, Iran, Kazakhstan, Russia, and Turkmenistan.

The Caspian presents a unique legal situation: it is an enclosed body of water with no connection to any ocean, making MARPOL technically inapplicable as a matter of treaty interpretation (MARPOL applies to “ships operating in the marine environment,” a term that the convention’s annexes read against sea boundaries). The Tehran Convention therefore operates as the primary environmental instrument for Caspian shipping, including the substantial oil tanker traffic connecting Caspian petroleum fields to pipeline terminals.

The convention is UNEP-administered from the Tehran-based Caspian Environment Convention Information Centre (CEIC). It has one protocol in force: the Protocol for the Protection of the Caspian Sea Against Pollution from Land-Based Sources and Activities (2012 adoption, 2021 entry into force).

Black Sea: The Bucharest Convention

The Bucharest Convention of 1992, formally the Convention on the Protection of the Black Sea Against Pollution, was signed in Bucharest on 21 April 1992 and entered into force on 15 January 1994. Its six parties are Bulgaria, Georgia, Romania, Russia, Turkey, and Ukraine.

The Black Sea Commission, based in Istanbul, administers the convention. Three protocols came into force with the convention: the Protocol on Protection of the Black Sea Marine Environment Against Pollution from Land-Based Sources, the Protocol on Co-operation in Combating Pollution of the Black Sea Marine Environment by Oil and Other Harmful Substances in Emergency Situations, and the Protocol on Protection of the Black Sea Marine Environment Against Pollution by Dumping.

The Black Sea is a MARPOL Annex I, II, and V special area. The MARPOL Annex V restrictions, prohibiting the discharge of garbage from ships in the Black Sea, apply alongside the Bucharest Convention’s own prohibition on dumping. The war context affecting Russia and Ukraine since 2022 has created documented enforcement gaps and has delayed several Bucharest Convention technical activities, a real operational constraint on a living treaty system.

Baltic Sea: HELCOM and the Helsinki Convention

The Helsinki Convention, administered by the Helsinki Commission (HELCOM), has a longer history than most Regional Seas programmes. The original Convention on the Protection of the Marine Environment of the Baltic Sea Area was signed in Helsinki in 1974, the same year UNEP launched the Regional Seas Programme. A revised convention was adopted in 1992, entering into force on 17 January 2000, to account for the accession of Estonia, Latvia, and Lithuania following the Soviet Union’s dissolution.

HELCOM’s ten contracting parties are Denmark, Estonia, the European Union, Finland, Germany, Latvia, Lithuania, Poland, Russia, and Sweden. The Baltic is the world’s largest body of brackish water and one of the most pollution-stressed major seas: hypoxic and anoxic zones in the Baltic deep basins have expanded measurably over the 20th century due to eutrophication from agricultural runoff.

The Baltic Sea is designated under MARPOL Annexes I (oil), II (noxious liquid substances), IV (sewage), V (garbage), and VI (air emissions as an Emission Control Area). It is the only sea in the world designated under all six MARPOL Annexes that apply spatially. The Annex VI ECA designation for both SOx and NOx applies to the Baltic, meaning ships in Baltic waters must burn 0.10% sulfur fuel or equivalent and meet Tier III NOx standards, substantially more stringent than global requirements.

North-East Atlantic: OSPAR

The OSPAR Convention of 1992, formally the Convention for the Protection of the Marine Environment of the North-East Atlantic, consolidated two earlier conventions: the Oslo Convention (1972) on dumping and the Paris Convention (1974) on land-based sources. OSPAR entered into force on 25 March 1998. Its 15 contracting parties are Belgium, Denmark, the European Union, Finland, France, Germany, Iceland, Ireland, Luxembourg, the Netherlands, Norway, Portugal, Spain, Sweden, and Switzerland.

The OSPAR Commission, based in London, operates through five Annexes covering land-based sources, dumping, offshore oil and gas, environmental assessment, and the protection and conservation of ecosystems and biodiversity. OSPAR’s network of Marine Protected Areas (MPAs) extends into international waters of the North-East Atlantic, making it one of the few regional instruments with legal reach beyond national jurisdiction.

OSPAR’s Annex V, on ecosystems and biological diversity, has driven significant work on deep-sea habitats in the North-East Atlantic, including seamounts and cold-water coral reefs. The Bonn Agreement of 1983 covers oil pollution emergency response in the same area and works alongside OSPAR.

Pacific: The Noumea Convention

The Noumea Convention of 1986, formally the Convention for the Protection of the Natural Resources and Environment of the South Pacific Region, was adopted in Noumea, New Caledonia in November 1986 and entered into force in 1990. It is administered by the Secretariat of the Pacific Regional Environment Programme (SPREP), based in Apia, Samoa.

The Pacific programme covers a vast ocean area encompassing Australia, New Zealand, and 22 Pacific island nations and territories. Its protocols include a Dumping Protocol and an Emergency Protocol (both in force since 1990), and two further protocols on oil pollution and hazardous substances that have not yet entered into force. The convention is categorized as a non-UNEP-administered partner programme, with SPREP maintaining its own governance and funding structure independently of UNEP’s budget.

North-East Pacific: The Antigua Convention

The Antigua Convention of 2002, formally the Convention for Cooperation in the Protection and Sustainable Development of the Marine and Coastal Environment of the North-East Pacific, was signed in Antigua, Guatemala in February 2002. Its parties include Colombia, Costa Rica, El Salvador, Guatemala, Honduras, Mexico, Nicaragua, Panama, and Peru. As of 2025, the convention had not yet entered into force, requiring a threshold number of ratifications that had not been reached.

The North-East Pacific faces significant threats from land-based runoff, as-yet-undeveloped offshore areas, and the biological significance of its kelp forest ecosystems. The programme operates an action plan coordinating environmental monitoring and national reporting among the signatory states pending the convention’s entry into force.

South Asian Seas: SACEP

The South Asian Seas programme operates without a regional convention. Its action plan was formally adopted in 1995, administered by the South Asia Co-operative Environment Programme (SACEP) in Colombo, Sri Lanka. The five participating states are Bangladesh, India, Maldives, Pakistan, and Sri Lanka.

The absence of a binding convention reflects the geopolitical tensions between India and Pakistan, which have made treaty-level commitment difficult. The programme relies on the action plan framework and bilateral or subregional cooperation to pursue its environmental monitoring and management agenda.

East Asian Seas: COBSEA

The East Asian Seas Action Plan was first adopted in 1981 and revised in 1994. COBSEA (the Coordinating Body on the Seas of East Asia) brings together nine states: Cambodia, China, Indonesia, Republic of Korea, Malaysia, Philippines, Singapore, Thailand, and Vietnam. It is UNEP-administered from Bangkok. Like the South Asian Seas, there is no binding convention for the East Asian Seas: the programme operates through the action plan and working group structures, coordinating on marine litter, land-based pollution, and marine protected areas.

Northwest Pacific: NOWPAP

The Action Plan for the Protection, Management and Development of the Marine and Coastal Environment of the Northwest Pacific Region (NOWPAP) was adopted in September 1994. Its four members are China, Japan, South Korea, and Russia. NOWPAP has no binding convention but coordinates through four regional activity centres: CEARAC (special monitoring and coastal zone management, Toyama), DINRAC (data and information network, Beijing), MERRAC (marine environmental emergency preparedness and response, Busan), and POMRAC (pollution monitoring, Vladivostok). The Yellow Sea, Sea of Japan, and Sea of Okhotsk fall within NOWPAP’s geographic scope.

Arctic: PAME

The Protection of the Arctic Marine Environment (PAME) programme operates under the Arctic Council, the intergovernmental forum established by the Ottawa Declaration of 1996. PAME is not a convention secretariat: there is no binding Arctic regional seas convention equivalent to Barcelona or Kuwait. The Arctic Council’s working group structure, with PAME as the marine environment working group, coordinates among the eight Arctic states (Canada, Denmark/Greenland, Finland, Iceland, Norway, Russia, Sweden, United States) plus observer states.

PAME’s most significant output is the Arctic Marine Shipping Assessment (AMSA), first published in 2009, and its ongoing work on the implementation of the IMO Polar Code. The Polar Code entered into force on 1 January 2017 and imposes construction, equipment, operational, and environmental standards on ships in Arctic and Antarctic waters.

Antarctic: CCAMLR

The Convention on the Conservation of Antarctic Marine Living Resources (CCAMLR), adopted in May 1980 and entering into force in April 1982, predates its formal designation as an independent Regional Seas programme. The CCAMLR Commission, based in Hobart, Australia, manages living marine resources in the Southern Ocean, including the critical krill stock that underpins the Antarctic food web.

CCAMLR is the only Regional Seas instrument where conservation of living resources rather than pollution control is the primary mandate. It operates alongside the Antarctic Treaty of 1959 and the Antarctic special area and Polar Code designations under MARPOL. The Antarctic area is a MARPOL special area under Annexes I, II, and V.

The Protocol Structure Pattern: How Standards Are Set

The way Regional Seas programmes create binding standards follows a consistent architecture that practitioners encountering any one convention will recognize in all others.

The framework convention establishes the obligation to negotiate protocols. The protocols, adopted by the Conference of the Parties, require separate ratification to enter into force. A protocol typically defines specific prohibited substances or discharge limits (mirroring or exceeding MARPOL thresholds where applicable), the monitoring regime parties must maintain, the reporting requirements, and the emergency response coordination obligations.

Protocols on specially protected areas follow a common pattern: parties designate national SPAs and contribute to a regional list. The regional list, once adopted by the COP, creates a floor obligation on all parties to apply common management standards regardless of whether the area lies in national waters. In the Mediterranean’s SPAMI list and OSPAR’s MPA network, this mechanism extends to international waters, giving the regional instrument reach beyond what unilateral national action could achieve.

Emergency response protocols are operationally critical for shipping. They establish the duty to report pollution incidents to neighboring states, the mutual assistance obligation, and the coordination mechanism for joint response operations. For ships in the ROPME Sea Area, for instance, an oil spill incident triggers parallel reporting obligations under the Kuwait Convention’s emergency protocol and the MARPOL OPA reporting requirements, with ROPME coordinating among member state coast guards.

Intersection with MARPOL Special Areas and PSSAs

The relationship between Regional Seas conventions and IMO instruments is not hierarchical: they are parallel systems that reinforce each other through overlapping coverage and mutual information flows.

MARPOL special areas are designated by IMO itself, on the basis of a state or group of states submitting a proposal backed by scientific evidence of the area’s ecological sensitivity and traffic characteristics. The monitoring networks established under Regional Seas action plans are often the source of that scientific evidence. The Mediterranean’s MARPOL Annex I special area status, for instance, draws on MAP’s Mediterranean Pollution Monitoring and Research Programme (MED POL), which has been collecting water quality and pollution trend data since 1975.

PSSAs follow the same data relationship. A PSSA designation by IMO requires documentation of the area’s special attributes (ecological, socioeconomic, or scientific), its vulnerability to damage from shipping, and the protective measures that will be adopted. The Baltic Sea’s PSSA designation (one of the world’s first, approved by IMO in 2005) drew on HELCOM’s two decades of systematic environmental data. The Baltic Sea PSSA encompasses essentially the entire Baltic, combining the special area (for discharge purposes) with a PSSA overlay that enables additional ship routing and reporting measures.

Other overlaps where regional conventions and IMO designations coincide: the Great Barrier Reef PSSA falls within the Noumea Convention region; the Galapagos is within the Lima Convention and South-East Pacific action plan area; the Western European Waters PSSA overlaps with the OSPAR area.

The operational lesson for shipowners and operators is that entering a Regional Seas convention area doesn’t change the flag state’s MARPOL obligations, which exist regardless. But it does mean that the port states in that region are likely to apply stricter discharge standards through regional action plan agreements, that emergency reporting requirements may be more detailed, and that encounter probability with coast guard or port state control officers trained on the regional convention standards is high.

Connection to the BBNJ Agreement

The Agreement on Marine Biological Diversity of Areas Beyond National Jurisdiction (BBNJ Agreement), adopted by the UN General Assembly on 19 June 2023, creates the first global legal mechanism for establishing marine protected areas on the high seas and for conducting environmental impact assessments of activities in areas beyond national jurisdiction.

The BBNJ Agreement explicitly references Regional Seas Conventions and Action Plans as existing frameworks with which it must “promote coherence and complementarity.” In practice, this means that area-based management tools established under the BBNJ Agreement in ocean areas adjacent to Regional Seas convention zones will be expected to coordinate with the relevant secretariats. OSPAR’s existing high-seas MPAs in the North-East Atlantic, for instance, are explicitly recognized as a reference point in the BBNJ treaty negotiations.

UNEP submitted a formal offer to host the BBNJ Agreement’s permanent secretariat, citing its institutional experience supporting 18 regional seas programmes, its established relationships with over 140 national environmental agencies, and its systems for treaty conference services and inter-agency coordination. A decision on the secretariat host was pending as of mid-2025.

The Regional Seas programmes can serve as implementation channels for the BBNJ Agreement’s environmental impact assessment provisions. A ship operator conducting an activity with potential high-seas impacts in the vicinity of the Mediterranean, the OSPAR area, or the East African convention zone may find that the relevant Regional Seas secretariat becomes involved in the EIA notification process as the BBNJ Agreement’s rules bed down.

The Ramsar Convention, which covers coastal and marine Ramsar sites, operates alongside Regional Seas frameworks on shared habitats including mangroves, seagrass beds, and shallow-water coral systems.

Global Coordination: The Biennial Global Meetings

The Global Meetings of the Regional Seas Conventions and Action Plans (the “Global Meetings”) are the central coordination mechanism for the entire programme. Convened every two years by UNEP, they bring together the secretariats of all 18 programmes, national delegates, UN agency partners, and observer organizations.

The 24th Global Meeting, held in June 2025, endorsed the Regional Seas Strategic Directions 2026-2029. The vision statement adopted reads: “prosperous and climate resilient seas and their respective coastal regions with biologically diverse, healthy, productive, conserved, restored and effectively used marine and coastal ecosystems for the benefit of people and nature.” The strategic directions are aligned with the Kunming-Montreal Global Biodiversity Framework (adopted at COP15 in December 2022), which set the 30x30 target of protecting 30% of the world’s land and ocean by 2030.

Global Meetings also provide the forum where cross-cutting issues, such as marine litter, climate change adaptation in coastal zones, and the implementation of the BBNJ Agreement, are addressed across all 18 regional programmes simultaneously.

Effectiveness: What the Record Shows

The Regional Seas Programme’s record is uneven in ways that practitioners should understand before treating any convention as conferring automatic protection.

On the positive side: the Barcelona Convention’s monitoring programme (MED POL) has documented a measurable reduction in heavy metal concentrations in Mediterranean coastal waters since the 1970s, attributed at least in part to tighter industrial discharge standards enforced under the Land-Based Sources Protocol. HELCOM’s Baltic Sea Action Plan, adopted in 2007, set specific pollution load reduction targets for the eight major river basins draining into the Baltic, creating the first basin-scale nitrogen and phosphorus management framework in a regional seas context. CCAMLR’s krill catch limits have maintained Southern Ocean krill stocks through four decades of commercial harvesting pressure.

The less positive side is equally documented. The IISD’s assessment of the programme describes it as “suffering from its own successes”: as the number of programmes expanded from six in 1974 to eighteen, UNEP’s core financial contribution per programme shrank, staff numbers at regional coordinating units fell, and several programmes lost momentum in monitoring and enforcement. The Kuwait Convention’s ROPME secretariat, operating in one of the world’s most economically active sea areas, operates with a budget that critics have argued is inadequate for the scale of offshore oil production in the Gulf.

Implementation gaps are largest where political instability coincides with weak environmental enforcement capacity. The Jeddah Convention area has been affected by the Yemen conflict, which interrupted Yemen’s participation in PERSGA activities for an extended period. The Nairobi Convention region includes Somalia, whose coastal environmental enforcement collapsed during the period of state fragility in the 2000s.

Limitations

Regional Seas conventions operate within boundaries that all practitioners should keep in mind.

They bind only ratifying states. A state may participate in the action plan’s monitoring activities without ratifying all protocols, meaning its ships may enter a convention area without their flag state being bound to the stricter standards that ratifying states apply.

Convention obligations and enforcement are asymmetric. A regional convention secretariat cannot compel a party to prosecute a discharge violation. Enforcement relies on each party’s national law and coast guard capacity, which varies by orders of magnitude across a programme like the Nairobi Convention.

The conventions’ spatial scope ends at the outer limit of national jurisdiction (200-nautical-mile EEZ or continental shelf, as defined by UNCLOS). The exception is OSPAR’s Annex V and the Mediterranean’s SPAMI list, which can designate areas in international waters, but this remains exceptional. Activities in the high seas portions of a Regional Seas geographic area fall under MARPOL and UNCLOS, not the regional convention, unless the programme has explicitly extended its legal reach.

Protocol ratification lags well behind convention ratification. In every Regional Seas programme, fewer states have ratified the protocols than have ratified the framework convention. The result is a patchwork of obligations within a single sea: two neighboring states may share the same convention but apply different protocol obligations to pollution from their ports and waters.

Monitoring data quality is uneven. The scientific infrastructure underlying an action plan assessment in the Mediterranean, with its 50-year MED POL dataset, is incomparable to what is available in the Noumea Convention area. Decisions made on insufficient monitoring data are a structural limitation of the least-resourced programmes.

Significance for Shipping Operations

The practical intersection of Regional Seas conventions with shipping operations runs through four channels.

Port state control: regional PSC memoranda of understanding often align with Regional Seas convention coverage. The Paris MOU (North-East Atlantic and Baltic) and the Tokyo MOU (Asia-Pacific) enforce MARPOL standards that are supplemented by regional convention standards. A ship trading between regional seas convention ports will encounter PSC inspectors whose checklists include region-specific discharge requirements.

Special area and PSSA compliance: ships entering designated special areas under MARPOL Annex I, MARPOL Annex V, or the Annex VI ECAs covering the Baltic and North Sea must meet the discharge and emission standards applicable to those areas, regardless of the regional convention. The regional convention provides the political and scientific context, but MARPOL provides the directly applicable discharge rule.

Emergency reporting: pollution incidents in a regional convention area trigger dual reporting obligations: the flag state obligation under MARPOL and the coastal state obligation under the relevant regional emergency protocol. HELCOM’s RESPONSE tool and REMPEC (the Regional Marine Pollution Emergency Response Centre for the Mediterranean and Black Sea) are the operational coordination centers where both streams converge for the Baltic and Mediterranean respectively.

Environmental impact assessments: port development, dredging, offshore installation, and route changes in sensitive areas within Regional Seas convention zones may trigger EIA requirements under regional convention protocols, layered on top of national EIA law and the emerging BBNJ Agreement EIA framework.

Understanding which Regional Seas convention or action plan applies to a given trading area is therefore not a theoretical exercise: it determines the suite of environmental obligations layered on top of global MARPOL and UNCLOS requirements.

See Also

• Barcelona Convention 1976
• Cartagena Convention 1983
• Abidjan Convention 1981
• Nairobi Convention 1985
• Kuwait Convention 1978
• Jeddah Convention 1982
• Lima Convention 1981
• Bucharest Convention 1992
• Tehran Convention 2003
• Antigua Convention 2002
• Noumea Convention 1986
• HELCOM Convention 1992
• OSPAR Convention 1992
• PSSA Overview
• MARPOL Annex I
• MARPOL Annex V
• Ramsar Convention
• Polar Code
• Antarctic Special Area and Polar Code
• Antarctic Treaty 1959
• Bonn Agreement 1983
• Wider Caribbean Region