The Australian-Antarctic Basin is one of three major basins in the Southern Ocean. This southern hemisphere basin extends from its eastern boundary with the Pacific-Antarctic Basin at the longitude of Tasmania (at about 145 degrees E) to the Kerguelan Plateau (at about 75 degrees E). The southeast Indian Ridge separates the Australian-Antarctic Basin from the Indian Ocean at depths greater than 4000 meters except for a gap in the Ridge at 117 degrees E.
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