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The Australian Antarctic Division (AAD) maintains a permanent base on the island. The base's residents are the island's only inhabitants, ranging from 20 to 40 people throughout the year.
The island is about 34 km long and 5 km wide, with an area of 128 sq km. In 1997 it became a world heritage site, and it is also a Tasmanian State Reserve.
See also: Sub-antarctic islands.