Western Australia (commonly abbreviated as WA) is one of the six states of Australia.
It occupies the entire western third of the Australian continent. It is bordered by the Indian Ocean to the north and west, the Great Australian Bight and Indian Ocean to the south, the Northern Territory to the north-east and South Australia to the south-east. Western Australia is Australia's largest state and the second largest subnational entity in the world.
Its capital is Perth.
It has 2.3 million inhabitants (10% of the national total), 85% of whom live in the south-west corner of the state.
For more details see http://en.wikipedia.org/wiki/Western_Australia