Brisbane is Queensland's capital, and the third largest city in Australia with a population of 2.1 million. Brisbane covers an area of 5,949 square kilometers (2,297 square miles) along the east coast of the continent.he capital of Australia is Canberra, which is located in the Australian Capital Territory in southeastern Australia. Canberra has a population of about 367,000, making it the largest inland city in the country, but the eight largest city in all.