Heard Island and McDonald Islands

External territory of Australia

The Territory of Heard Island and McDonald Islands is an Australian external territory in the southern Indian Ocean. Discovered in the mid-19th century, the territory is a group of sub-Antarctic volcanic islands that lie on the Kerguelen Plateau. It is about 4000 kilometres (2500 mi) south-west of the Australian mainland and 1700 kilometres (1100 mi) north of Antarctica. The territory contains Australia's only active volcanoes and is home to its highest point outside the Australian Antarctic Territory, Mawson Peak. The territory is uninhabited and has been described as one of the most remote places on Earth.

Text: Wikipedia — Heard Island and McDonald IslandsCC BY-SA 4.0 · revised 2026-07-24