Tidbinbilla Nature Reserve is a 54.5 square kilometres (21.0 sq mi) protected area, on the fringe of Namadgi National Park. Tidbinbilla is a short drive from the capital city of Australia, Canberra, in the Australian Capital Territory. Known sites of Aboriginal significance at Tidbinbilla include the Birriagi Rock Shelter, which is the oldest Aboriginal site within the Australian Capital Territory. Bogong Rocks is a shelter where the oldest evidence of Aboriginal occupation was found at a bogong moth resting site.