Australia, Commonwealth of Australia - a nation occupying the whole of the Australian continent; aboriginal tribes are thought to have migrated from southeastern Asia 20,000 years ago; first Europeans were British convicts sent there as a penal colony

Australia - the smallest continent; between the South Pacific and the Indian Ocean

Australian Alps - a range of mountains in Australia that forms the southern end of the Great Dividing Range

chain of mountains, mountain chain, mountain range, range of mountains, range, chain - a series of hills or mountains; "the valley was between two ranges of hills"; "the plains lay just beyond the mountain range"