Subregions- Ascension Island region
 - Azores-Cape St. Vincent Ridge
 - Azores Islands, Portugal
 - Azores Islands region
 - Bermuda region
 - Bouvet Island region
 - Cape Verde
 - central Mid-Atlantic Ridge
 - east of Trinidad, Trinidad and Tobago
 - English Channel
 - Fernando de Noronha, Brazil region
 - Martin Vaz, Brazil region
 - North Atlantic Ocean
 - northeast of Barbados, Windward Islands
 - northern Mid-Atlantic Ridge
 - north of Anguilla, Leeward Islands
 - north of Ascension Island
 - north of Puerto Rico
 - north of the Dominican Republic
 - north of the Virgin Islands
 - Reykjanes Ridge
 - South Atlantic Ocean
 - southeastern Atlantic Ocean
 - southern Mid-Atlantic Ridge
 - southwest of Africa
 - St. Helena region
 - Trindade, Brazil region
 - Tristan da Cunha region

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