Lying southeast of Asia, between the Pacific and Indian oceans, Australia, the world's smallest continent, is almost completely surrounded by ocean expanses. Australia is slightly smaller than the United States, with a total area of 7,686,850 sq km (2,967,909 sq mi). The five mainland states are New South Wales, 801,600 sq km (309,500 sq mi); Queensland, 1,727,200 sq km (666,900 sq mi); South Australia, 984,000 sq km (379,900 sq mi); Victoria, 227,600 sq km (87,900 sq mi); and Western Australia, 2,525,500 sq km (975,100 sq mi). The island state of Tasmania has an area of 67,800 sq km (26,200 sq mi); the Northern Territory, 1,346,200 sq km (519,800 sq mi); and the Australian Capital Territory, 2,400 sq km (900 sq mi). The country, including Tasmania, extends about 4,000 km (2,500 mi) E – W and 3,180 km (1,980 mi) N – S .
Australia is bounded on the N by the Timor and Arafura seas, on the NE by the Coral Sea, on the E by the Pacific Ocean, on the SE by the Tasman Sea, and on the S and W by the Indian Ocean, with a total coastline of 25,760 km (16,007 mi). Neighboring areas include Irian Jaya (part of Indonesia) and Papua New Guinea to the north, New Zealand to the southeast, and Indonesia to the northwest.
Australia's capital city, Canberra, is located in the southeastern part of the country.