Subregions- Ascension Island region
 - Azores-Cape St. Vincent Ridge
- Azores Islands, Portugal
- Azores Islands region
- Bouvet Island region
- central Mid-Atlantic Ridge
- North Atlantic Ocean
- northern Mid-Atlantic Ridge
- north of Ascension Island
- Reykjanes Ridge
- South Atlantic Ocean
- southeastern Atlantic Ocean
- southern Mid-Atlantic Ridge
- southwest of Africa
- Tristan da Cunha region
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