The term CITY AUSTRALIA is represented by four cities in Australia: Perth (5 letters), Darwin (6 letters), Brisbane (8 letters) and Sydney (6 letters). Perth is the capital of Western Australia and is located on the Swan River. Darwin is the capital of the Northern Territory and is situated on the Timor Sea. Brisbane is the capital of Queensland and is located on the Brisbane River. Sydney is the most populous city in Australia and is located on the east coast of the country.