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‘Ālika Knoll (Knoll(s)) |
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110 Miles Holes (Hole) |
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Abbeville Basin (Basin) |
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Abbeville Mound (Mound) |
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Abra Canyon (Canyon(s)) |
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Acadia Mound (Mound) |
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Acadiana Basin (Basin) |
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Acadiana Canyon (Canyon(s)) |
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Accomac Canyon (Canyon(s)) |
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Acis North Shoal (Shoal) |
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Acis Shoals (Reef) |
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Acis South Shoal (Shoal) |
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Adak Basin (Basin) |
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Adams Bank (Bank) |
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Addai Caddo Basin (Basin) |
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Addington Patch (Reef) |
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Adélie Valley (Submarine valley(s)) |
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Adeline Bank (Bank) |
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Adolph Seamount (Seamount(s)) |
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Adriatic Basin (Basin) |
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Adriatic Plain (Plain) |
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Adventure Trough (Trough) |
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Afa’maolek Seamount (Seamount(s)) |
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Afungi Canyon (Canyon(s)) |
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Aganak Canyon (Canyon(s)) |
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Agard Seamount (Seamount(s)) |
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Agassiz Basin (Trough) |
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Agassiz Valleys (Submarine valley(s)) |
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Agligadak Canyon (Canyon(s)) |
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Agouti Bank (Bank) |
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Aguja Canyon (Canyon(s)) |
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Aitken Reef (Reef) |
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Aja Fracture Zone (Fracture Zone) |
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Akamai Seamount (Knoll(s)) |
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Akashi Knoll (Knoll(s)) |
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Alabama-Coushatta Basin (Basin) |
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Alaminos Bank (Bank) |
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Alaminos Fan (Fan) |
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Alamo Mound (Mound) |
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Alarcón Seamount (Seamount(s)) |
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Albany Canyon (Canyon(s)) |
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Albany Seamount (Seamount(s)) |
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Albatross Knoll (Knoll(s)) |
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Albay Shoal (Reef) |
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Albemarle Shelf Valley (Submarine valley(s)) |
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Alborán Plain (Plain) |
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Alborán Trough (Trough) |
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Alcalá de Chivert Canyon (Canyon(s)) |
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Alderdice Bank (Bank) |
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Aleut Knoll (Knoll(s)) |
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Aleut Valley (Submarine valley(s)) |
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Alexandra Bank (Reef) |
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Alga Bank (Bank) |
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Alice Reef (Reef) |
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Alice Spur (Spur) |
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Alicia Annie Reef (Atoll) |
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Alison Reef (Reef) |
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Alle Bank (Bank) |
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Allegheny Seamount (Seamount(s)) |
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Allison Guyot (Tablemount) |
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Almirante Leite Knolls (Knoll(s)) |
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Alnilam Mound (Mound) |
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Alnitak Mound (Mound) |
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Alphard Banks (Bank) |
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Alsea Ridge (Ridge) |
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Altnacraig Shoal (Shoal) |
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Alvin Canyon (Canyon(s)) |
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Amanogawa Seamounts (Seamount(s)) |
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Amanohashidate Hole (Hole)  has preferred alternative Isen Hole |
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Amatignak Basin (Basin) |
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Amatignak Canyon (Canyon(s)) |
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Amatignak Spur (Spur) |
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Ambelau Basin (Basin) |
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Amchitka Canyon (Canyon(s)) |
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Amchitka Spur (Spur) |
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Amélia Canyon (Canyon(s)) |
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Amerasia Basin (Basin) |
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Amery Knoll (Knoll(s)) |
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Amery Terrace (Terrace) |
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Amirante Bank (Bank) |
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Amlia Fracture Zone (Fracture Zone) |
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Amlia Sill (Sill) |
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Ammen Basin (Basin) |
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Ammen Rock (Reef) |
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Ammen Swell (Rise) |
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Amonhana Spur (Spur) |
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Ampa Patches (Reef) |
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Amphitheaters Basin (Basin) |
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Amrum Grund (Bank) |
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Amy Douglas Bank (Bank) has preferred alternative Hirane Shoal |
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Anabar-Khatanga Valley (Submarine valley(s)) |
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Anderson Basin (Basin) |
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Andreasen Seamount (Seamount(s)) |
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Andregg Seamount (Seamount(s)) |
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Anegada Canyon (Canyon(s)) |
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Angsi Field (Oil field) |
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Anguilla Valley (Submarine valley(s)) |
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Año Nuevo Canyon (Canyon(s)) |
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Anoa Field (Oil field) |
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Anoli Bank (Bank) |
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Antelope Shoal (Reef) |
