The island, in Oates Land, also forms part of the Ross Dependency, claimed by New Zealand.

Of volcanic origin, it is about 12 km (7.5 mi) in width, with a maximum length of 37 km (23 mi),[1] between Cape Freeman in the north and Cape Smyth in the south.

The island's highest point reaches 1,524 m (5,000 ft)[2] with the unclimbed stratovolcano Brown Peak, the highest point in the Balleny chain.

A 4,655 ha site on the island has been designated an Important Bird Area (IBA) by BirdLife International because it supports extensive breeding colonies of southern fulmars and snow petrels on ice free cliffs along the western and northern coasts.

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