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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