Mount Kosciuszko is the tallest mountain peak in mainland Australia at 2,228 meters (7,310 feet) tall. It is located in the state of New South Wales, in the southeastern part of the country. It is not technically Australia’s largest peak, because a volcano (Mawson Peak) on the Australian-owned Heard Island off the coast of Antarctica is taller. While Mawson Peak is politically part of Australia, geographically it is considered to be “sub-Antarctica.”