Augusta is a town on the south-west coast of Western Australia, where the Blackwood River flows into Flinders Bay. It is the nearest town to Ca…Augusta is a town on the south-west coast of Western Australia, where the Blackwood River flows into Flinders Bay. It is the nearest town to Cape Leeuwin, on the furthest southwest corner of the Australian continent. In the 2001 census it had a population of 1,091; by 2016 the population of the town was 1,109.