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| Southeast Atlantic | |
|---|---|
| Name | Southeast Atlantic |
Southeast Atlantic is a maritime region of the South Atlantic Ocean bordering the southern coasts of Namibia, South Africa, Angola (southern flank), and the island groups of the Tristan da Cunha archipelago and the Prince Edward Islands. It functions as a transitional zone between the subtropical South Atlantic and the subantarctic waters influenced by the Benguela Current and the Antarctic Circumpolar Current, affecting fisheries, shipping lanes, and regional climates.
The region includes continental margins off Namibia, South Africa, and southern Angola, extending toward the mid-Atlantic, and abuts the submerged features of the Walvis Ridge, Vema Seamount, and the margin near the Rio Grande Rise. Island features such as Bouvet Island (Norwegian claim), Gough Island (British Overseas Territory), and the Marion Island complex shape exclusive economic zones claimed by South Africa and United Kingdom. Bathymetric gradients connect the Cape Basin to the broader South Atlantic Ocean, influencing upwelling zones off the Benguela Current system.
Circulation in the area is dominated by the northward Benguela Current along the southwest African coast and interactions with the southward flow of the Brazil Current via the South Atlantic Gyre and exchanges with the Antarctic Circumpolar Current. Water mass properties reflect inputs from the Agulhas Current retroflection near the Cape of Good Hope and mixing processes at the Subtropical Front. Mesoscale eddies and fronts are frequently observed around Walvis Ridge and Tristan da Cunha, modulating nutrient fluxes and sea surface temperature patterns monitored by institutions such as the South African Weather Service and research programs like Global Ocean Observing System collaborations.
The Southeast Atlantic experiences variability from the El Niño–Southern Oscillation teleconnection and influences from the Southern Annular Mode, which alter precipitation and storm tracks over South Africa and Namibia. Seasonal shifts produce cold, nutrient-rich upwelling associated with the Benguela upwelling system, producing coastal fog and cool maritime climates along the Namib Desert coast. Cyclone activity is relatively rare compared to the Southwest Indian Ocean cyclone season, but extratropical storms tracking along the Roaring Forties and systems interacting with the Azores High can drive strong winds and swell affecting ports such as Cape Town and Walvis Bay.
Upwelling-driven productivity supports large populations of sardine and anchovy (important to regional fisheries monitored by the Commission for the Conservation of Antarctic Marine Living Resources and national agencies), seabirds including albatross and petrel species breeding on Gough Island and Tristan da Cunha, and marine mammals such as humpback whale, southern right whale, and populations of Cape fur seal and elephant seal. Benthic habitats over seamounts like Vema Seamount host endemic invertebrates and deepwater corals similar to records from the Mid-Atlantic Ridge. Conservation designations around Prince Edward Islands reflect concerns over invasive species and seabird declines documented by BirdLife International researchers.
Major ports such as Cape Town and Walvis Bay serve container, bulk, and fishing fleets linking regional trade routes to the Cape Route and transatlantic shipping lanes. Offshore fisheries target pelagic schools and demersal species with fleets from Namibia and South Africa and distant-water fleets flagged to states like Spain and Portugal participating in quota arrangements under regional bodies including the South West Atlantic Fisheries Commission-style frameworks and bilateral agreements. Marine resource extraction interests include oil and gas exploration on the continental shelf in blocks licensed by Angola and Namibia, and research by institutions such as the Council for Scientific and Industrial Research (South Africa), while navigation safety and search-and-rescue fall under the remit of regional maritime authorities and the International Maritime Organization conventions.
The maritime zones in the area involve overlapping exclusive economic zones claimed by South Africa, Namibia, and Angola, with outer continental shelf submissions to the United Nations Commission on the Limits of the Continental Shelf in some sectors. Strategic chokepoints near the Cape of Good Hope connect the Indian Ocean and the Atlantic Ocean, affecting naval deployments from states such as United States, China, and United Kingdom conducting patrols, anti-piracy efforts, and exercises with regional navies like the South African Navy. Conservation and maritime security initiatives often involve multilateral cooperation through organizations including the Southern African Development Community and the African Union.
Key environmental pressures include overfishing of small pelagics, bycatch affecting albatross and turtle populations, marine pollution from shipping incidents near major ports, and potential impacts from hydrocarbon development. Climate-driven changes such as ocean warming and deoxygenation threaten the Benguela upwelling system and associated productivity, with consequences for food security in Namibia and South Africa. Conservation responses involve marine protected areas around Prince Edward Islands and species protection measures advocated by BirdLife International and the International Union for Conservation of Nature, along with regional fisheries management by national agencies and participation in treaties like the Convention on Biological Diversity.