The Great Australian Bight is a large oceanic bight, or open bay, off the central and western portions of the southern coastline of mainland Australia. There are two definitions for its extent—one by the International Hydrographic Organization and another by the Australian Hydrographic Service. The bight is generally considered part of the Indian Ocean, a…The Great Australian Bight is a large oceanic bight, or open bay, off the central and western portions of the southern coastline of mainland Australia. There are two definitions for its extent—one by the International Hydrographic Organization and another by the Australian Hydrographic Service. The bight is generally considered part of the Indian Ocean, although the AHS classifies it as part of the Southern Ocean. Its coastline is characterized by cliff faces and rocky capes, making it an ideal location for whale-watching.