Seas of the Atlantic Ocean

Seas of the Atlantic Ocean
Name	Atlantic Ocean seas
Caption	Major seas, gulfs and bays of the Atlantic basin
Location	Atlantic Ocean
Type	Oceanic marginal seas
Countries	United States, Canada, Mexico, Brazil, Argentina, United Kingdom, Ireland, France, Spain, Portugal, Norway, Iceland, Morocco, Senegal, Nigeria, Ghana, Cabo Verde, Sierra Leone, Guinea, Angola, Namibia, South Africa, Uruguay, Cuba, Jamaica, Haiti, Dominican Republic, Bahamas, Bermuda, Greenland

Contents

Seas of the Atlantic Ocean The seas of the Atlantic Ocean encompass a network of marginal seas, gulfs, bays and shelf waters that link continental margins from Arctic Ocean gateways to subantarctic passages near Southern Ocean. These marine regions include storied waters such as the Mediterranean Sea, Caribbean Sea, Baltic Sea and North Sea and extend to lesser-known basins like the Sargasso Sea and Labrador Sea. Their boundaries intersect with major states and institutions including European Union, African Union, NATO members and regional fisheries management organizations like International Commission for the Conservation of Atlantic Tunas.

Geography and Boundaries

Atlantic seas are delineated by rim geography and international law such as the United Nations Convention on the Law of the Sea and regional agreements like the Treaty of Tordesillas historical claims. Northern margins abut the Norwegian Sea, Greenland Sea, and Barents Sea adjacent to Svalbard, Iceland, and Norway; the eastern Atlantic borders include the Bay of Biscay, Gulf of Cádiz, and North Sea beside Spain, Portugal, France, and United Kingdom. Western rim seas touch Gulf of Mexico, Chesapeake Bay, Labrador Sea, and shelf areas near United States and Canada. Southern extents meet the South Atlantic Gyre and include the Falkland Islands waters, Rio de la Plata, and passages near Cape Town and Cape Verde.

North Atlantic: prominent basins such as the Labrador Sea, Irminger Sea, Greenland Sea, Norwegian Sea, Barents Sea, North Sea, Baltic Sea, Irish Sea, Celtic Sea, and the Bay of Biscay connect ports like Reykjavík, Bergen, Oslo, Bremenhaven, Rotterdam, Hamburg, Copenhagen, and Stockholm. Central Atlantic and Caribbean: includes the Caribbean Sea, Gulf of Mexico, Sargasso Sea, Bahama Channel, Lesser Antilles waters near Havana, Kingston, San Juan (Puerto Rico), Bridgetown and connects to the Panama Canal approaches. South Atlantic: contains the Brazilian Sea shelves, Argentina Bay systems, Falkland Sound, Rio de la Plata, and island waters around South Georgia and the South Sandwich Islands, Ascension Island, St Helena linked historically to voyages by James Cook and Charles Darwin. Mediterranean and connected seas: the Mediterranean Sea with its sub-basins — Adriatic Sea, Ionian Sea, Aegean Sea, Tyrrhenian Sea, Liguria Sea, Balearic Sea — connects through the Strait of Gibraltar to the Atlantic and interfaces with states such as Italy, Greece, Turkey, Egypt, Algeria, and Tunisia.

Atlantic seas are structured by large-scale currents like the Gulf Stream, North Atlantic Drift, Labrador Current, Canary Current, Benguela Current, Brazil Current, and the Antarctic Circumpolar Current influence at southern latitudes. Thermohaline circulation such as the Atlantic Meridional Overturning Circulation affects temperature and salinity gradients across basins like the Sargasso Sea and the Labrador Sea. Bathymetric features include the Mid-Atlantic Ridge, continental shelves off Grand Banks and Patagonia, abyssal plains, submarine canyons like Hudson Canyon, and seamounts such as Montes Atlantis-region features explored by institutions like NOAA and Woods Hole Oceanographic Institution. Seasonal stratification, upwelling zones off Namibia and Peru (via Humboldt Current influence into the South Atlantic), and estuarine dynamics in deltas like the Amazon River plume modify local circulation and productivity.

Atlantic seas host diverse ecosystems from polar ice-edge communities near Greenland and Svalbard to warm coral reefs in the Caribbean Sea, Bahamas Bank, and Cape Verde archipelago. Key habitats include kelp forests along Norway and Patagonia, mangrove systems in Brazil and Nigeria, seagrass meadows in Gulf of Mexico and Mediterranean Sea, and hydrothermal vent fauna along the Mid-Atlantic Ridge studied by Alfred Wegener Institute and Scripps Institution of Oceanography. Iconic species include Atlantic cod, bluefin tuna, sperm whale, humpback whale, green sea turtle, loggerhead sea turtle, leatherback sea turtle, and pelagic assemblages in the Sargasso Sea including Sargassum communities. Important biodiversity hotspots intersect with protected areas like the Azores Marine Park, Great Bahama Bank conservation sites, and UNESCO-designated sites near Doñana National Park and Gough Island.

Atlantic seas underpin fisheries targeted by fleets from Spain, Portugal, France, United Kingdom, Norway, Iceland, Japan (distant-water), and South Africa; species include herring, mackerel, anchovy, and shrimp supporting markets in London, Lisbon, Brest, Reykjavík, and Cape Town. Offshore hydrocarbon fields in the North Sea and Gulf of Mexico involve companies like BP, Shell, ExxonMobil, and state actors such as Petrobras and Pemex. Shipping lanes through chokepoints including the Strait of Gibraltar, English Channel, Barbados Channel, and approaches to the Suez Canal and Panama Canal sustain trade for ports like Rotterdam, New York City, Shanghai-linked transshipments, and Miami. Renewable energy development includes offshore wind off United Kingdom and Germany, tidal projects in Bay of Fundy near Halifax, and emerging blue economy initiatives with agencies like European Maritime Safety Agency and International Maritime Organization oversight. Tourism, cruise itineraries to Caribbean Sea islands, and cultural fisheries support livelihoods in Havana, Nassau, Santo Domingo, and Recife.

Atlantic seas have been central to Age of Discovery voyages by Christopher Columbus, Vasco da Gama, and Ferdinand Magellan and to empires such as the British Empire, Spanish Empire, and Portuguese Empire. Naval battles occurred in waters near Trafalgar, Jutland, and the Battle of the Atlantic in World War II with convoy routes linking Liverpool, New York City, Halifax, and St. John’s (Newfoundland). Cultural exchanges forged Atlantic worlds reflected in the Transatlantic slave trade routes connecting ports like Liverpool, Bristol, Lisbon, Salvador (Brazil), Dakar, and Goree Island, and in diasporas that shaped music genres such as blues, samba, reggae, salsa, and fado. Scientific exploration by figures and institutions including Jacques Cousteau, Charles Darwin, HMS Challenger, NOAA, and National Geographic Society advanced oceanography, while treaties like the 120-Mile Exclusive Economic Zone norms and conferences such as UNCLOS III formalized governance.