The Amundsen Sea is an airm o the Soothren Ocean aff Marie Byrd Land in wastren Antarctica. It is boondit bi Cape Flying Fish, the northwastren tip o Thurston Island tae the east an Cape Dart on Siple Island tae the wast. East o Cape Flying Fish stairts the Bellingshausen Sea. Wast o Cape Dart is na named marginal sea o the Soothren Ocean atween Amundsen Sea an Ross Sea. Named for the Norwegian polar explorer Roald Amundsen bi the Norwegian expedeetion o 1928–29, unner Captain Nils Larsen, while explorin this aurie in Februar, 1929.
The sea is maistly ice-covered, an the Thwaites Ice Tongue protrudes intoae it. The ice sheet which drains intae the Amundsen Sea averages aboot 3 km (1.9 mi) in thickness; is roughly the size o the state o Texas an the aurie is kent as the Amundsen Sea Embayment (ASE); it furms ane o the three major ice drainage basins o the Wast Antarctic Ice Sheet.