The Atlantic-Indian Basin is one of three major basins in the Southern Ocean. It extends from its western border with the Pacific-Antarctic Basin at the Scotia Ridge and Drake Passage (at about 70o W) to its eastern border with the Australian-Atlantic Basin at the Kerguelan Plateau (about 75oE). It consists of the Enderby and Weddell abyssal plains and is bounded to the north below 4000 meters by the Mid- Atlantic and South-West Indian Ridges except for deeper connections into the Argentine Basin in the western Atlantic and into the deep basins of the western Indian Ocean.
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