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

| |