The Cradle Mountain-Lake St Clair National Park is part of the Tasmanian Wilderness World Heritage Site. It is a large park with lakes, temperate rainforests and alpine heathland. Cradle Mountain is a jagged dolerite mountain peak. There are sites around the park where the Australian Aborigines lived 10,000 years ago during the last ice age. Tasmania's tallest mountain, Mt. Ossa, above sea level, is in the park.