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| Eastern Atlantic Ocean | |
|---|---|
| Name | Eastern Atlantic Ocean |
| Location | Atlantic Ocean |
| Type | Oceanic region |
| Basin countries | Portugal, Spain, France, United Kingdom, Ireland, Morocco, Mauritania, Senegal, The Gambia, Guinea-Bissau, Guinea, Sierra Leone, Liberia, Côte d'Ivoire, Ghana, Togo, Benin, Nigeria, Cameroon, Equatorial Guinea, Gabon, Sao Tome and Principe, Angola, Namibia, South Africa |
Eastern Atlantic Ocean is the eastern sector of the Atlantic Ocean bordering the western coasts of Europe, Africa, and island groups of the North Atlantic and South Atlantic. It includes coastal seas, continental shelves, abyssal plains, and archipelagos that connect major ports, fisheries, and oceanic corridors between Mediterranean Sea gateways, Gibraltar Strait, and southern ocean passages. The region has been central to navigation, trade, and biogeographic exchange among Iberian Peninsula states, West African kingdoms, and Atlantic island polities.
The region extends from maritime limits off Greenland and the Faroe Islands in the north along the western littoral of Iceland and the British Isles including United Kingdom and Ireland, down past the Bay of Biscay flanked by France and Spain, across the Gulf of Guinea and along the coasts of West Africa including Mauritania and Senegal to the continental shelf margins of Namibia and South Africa. It borders the Mediterranean Sea at the Gibraltar Strait and connects with the Southern Ocean via the waters south of the Cape of Good Hope. Prominent physiographic features include the Lisbon Canyon, the Iberian Basin, the Cape Verde Plateau, and the Sierra Leone Rise, as well as archipelagos such as the Azores, Madeira, Canary Islands, and Cape Verde.
Circulation in the east is influenced by the North Atlantic Current, the Canary Current, and the Benguela Current, creating gradients in temperature and salinity between temperate and tropical zones. Seasonal variability is modulated by the North Atlantic Oscillation and interannual phenomena such as the Atlantic Multidecadal Oscillation, producing upwelling off Mauritania and the Namibian coast that drives high productivity. Surface waters are subject to evaporation and freshwater input from river systems like the Seine, the Loire, the River Tagus, the Gambia River, and the Congo River, affecting thermohaline structure and stratification. Mesoscale eddies, boundary currents near the Iberian Peninsula, and deep-water formation regions influence nutrient transport and carbon sequestration linked to processes described in studies by institutions such as the National Oceanography Centre (UK), Ifremer, and Woods Hole Oceanographic Institution.
The eastern basin hosts diverse ecosystems from temperate kelp forests along the Atlantic Iberian coast to tropical mangroves in Senegal and coral assemblages near Sao Tome and Principe and Gabon. Productive upwelling zones support large pelagic populations including Atlantic mackerel, European pilchard, and Atlantic bluefin tuna, and are feeding grounds for migratory marine mammals such as the North Atlantic right whale and cetaceans studied by the International Whaling Commission. Continental shelf habitats sustain benthic communities and reef-associated species documented by the IUCN. Key biodiversity hotspots overlap with designated areas like Natura 2000 sites around Spain and Portugal and marine protected areas instituted by South Africa and Morocco.
Coastal states rely on the eastern Atlantic for shipping lanes connecting ports such as Lisbon, Seville, Bordeaux, Dakar, Accra, Lagos, Luanda, and Cape Town and for fisheries harvesting by fleets registered to Spain, Portugal, France, and China. Energy infrastructure includes offshore oil and gas fields near Cabo Delgado and the Angola margin, and wind energy projects off United Kingdom and Portugal planned by companies like Vestas and Equinor. Aquaculture, seabed mining interests, and tourism centered on archipelagos such as the Canary Islands and Madeira are economically significant and regulated under national authorities including Direção-Geral de Recursos Naturais, Segurança e Serviços Marítimos and Ministerio para la Transición Ecológica policies.
The eastern Atlantic was central to Age of Discovery voyages undertaken by navigators sponsored by the courts of Portugal and Castile such as Vasco da Gama and Christopher Columbus who used island chains including the Azores and Madeira as waypoints. Historic routes included trade winds-dependent passages to the Caribbean and the Americas and slaving routes integral to the Transatlantic slave trade that involved ports in Ghana and Senegal and firms like the Royal African Company. Naval engagements such as the Battle of Trafalgar and passages employed by explorers from James Cook later reshaped hydrographic knowledge compiled in charts by the British Admiralty and the Instituto Hidrográfico.
The region faces overfishing pressures affecting stocks of cod, hake, and sardine with management disputes adjudicated under institutions such as the European Union Common Fisheries Policy and the African Union frameworks. Pollution sources include oil spills from tankers transiting the Gibraltar Strait and nutrient runoff from river basins prompting hypoxia in estuaries studied by UNEP. Climate-driven impacts—sea surface warming, acidification, and shifting species ranges—affect coral reefs and upwelling systems monitored by programs like GEOMAR and IPCC assessments. Conservation responses include marine protected areas coordinated through Convention on Biological Diversity targets and regional agreements like the OSPAR Commission for the Northeast Atlantic and bilateral accords between Portugal and Morocco.
Sovereignty and jurisdictional claims are governed through the United Nations Convention on the Law of the Sea with Exclusive Economic Zones delineated by states including Spain, France, Portugal, and coastal African states, while disputes have arisen over continental shelf boundaries adjudicated at the International Tribunal for the Law of the Sea and via negotiations such as those between Mauritania and Spain. Regional fisheries management organizations, port authorities like Autoridade Portuária de Sines and security cooperation through NATO frameworks and African maritime security initiatives address piracy, search and rescue, and resource management.