States and territories of Australia in the context of "Cocos (Keeling) Islands"

Mainland Australia is the main landmass of the Australian continent, excluding the Aru Islands, New Guinea, Tasmania, and other Australian offshore islands. The landmass also constitutes the mainland of the territory governed by the Commonwealth of Australia, and the term, along with continental Australia, can be used in a geographic sense to exclude surrounding continental islands and external territories. Generally, the term is applied to the states of New South Wales, Queensland, South Australia, Victoria, and Western Australia, as well as the Australian Capital Territory, Jervis Bay Territory, and Northern Territory.

The term is typically used when referring to the relationship between Tasmania and the other Australian states, in that people not from Tasmania are referred to as mainlanders. Tasmania has been omitted on a number of occasions from maps of Australia, reinforcing the divide between Tasmania and the mainland. The 1982 Commonwealth Games in Brisbane left Tasmania off the map of Australia during the opening ceremony, as did the designs of the Australian Swim Team uniform for the 2014 Commonwealth Games in Glasgow.

There are eight capital cities in Australia, each of which functions as the seat of government for the state or territory in which it is located. One of these, Canberra, is also the national capital. Section 125 of the Constitution of Australia specified that the seat of the national government, that is, the national capital, would be in its own territory within New South Wales, at least 100 miles (161 km) from Sydney. The Constitution specified that until this national capital was ready, the Parliament would sit in Melbourne. In 1927, the national capital was finally ready and the national government relocated from its former seat in Melbourne to Canberra within the Australian Capital Territory (or the Federal Capital Territory as it was known at the time).

In each state and internal territory, the capital is also the jurisdiction's most populous city. The Australian external territory of Norfolk Island has its official capital at Kingston, although this acts merely as the administrative centre of government; its de facto capital is Burnt Pine.

South Australia (commonly abbreviated as SA) is a state in the southern central part of Australia. With a total land area of 984,310 square kilometres (380,044 sq mi), it is the fourth-largest of Australia's states and territories by area, which includes some of the most arid parts of the continent, and with 1.5 million people, it is the fifth-largest of the states and territories by population. This population is the second-most highly centralized in the nation after Western Australia, with more than 67% of South Australians living in the capital Adelaide or its environs. Other population centres in the state are relatively small; Mount Gambier, the second-largest centre, has a population of 26,878.

South Australia shares borders with all the other mainland states. It is bordered to the west by Western Australia, to the north by the Northern Territory, to the north-east by Queensland, to the east by New South Wales, and to the south-east by Victoria. To the south, its border is the ocean, the Great Australian Bight.

Sydney is the capital city of the state of New South Wales and the most populous city in Australia. Located on Australia's east coast, the metropolis surrounds Sydney Harbour and extends about 80 km (50 mi) from the Pacific Ocean in the east to the Blue Mountains in the west, and about 80 km (50 mi) from Ku-ring-gai Chase National Park and the Hawkesbury River in the north and north-west, to the Royal National Park and Macarthur in the south and south-west. Greater Sydney consists of 658 suburbs, spread across 33 local government areas. Residents of the city are colloquially known as "Sydneysiders". The estimated population in June 2024 was 5,557,233, which is about 66% of the state's population. The city's nicknames include the Emerald City and the Harbour City.

There is evidence that Aboriginal Australians inhabited the Greater Sydney region at least 30,000 years ago, and their engravings and cultural sites are common. The traditional custodians of the land on which modern Sydney stands are the clans of the Darug, Dharawal and Eora. During his first Pacific voyage in 1770, James Cook charted the eastern coast of Australia, making landfall at Botany Bay. In 1788, the First Fleet of convicts, led by Arthur Phillip, founded Sydney as a British penal colony, the first European settlement in Australia. After World War II, Sydney experienced mass migration and by 2021 over 40 per cent of the population was born overseas. Foreign countries of birth with the greatest representation are mainland China, India, the United Kingdom, Vietnam and the Philippines.

Tasmania (/tæzˈmeɪniə/; palawa kani: Lutruwita) is an island state of Australia. It is located 240 kilometres (150 miles) to the south of the Australian mainland, and is separated from it by the Bass Strait. The state encompasses the main island of Tasmania, the 26th-largest island in the world, and the surrounding 1000 islands. It is Australia's smallest and least populous state, with 573,479 residents as of June 2023. The state capital and largest city is Hobart, with around 40% of the population living in the Greater Hobart area. Tasmania is the most decentralised state in Australia, with the lowest proportion of its residents living within its capital city.

Tasmania's main island was first inhabited by Aboriginal peoples, who today generally identify as Palawa or Pakana. It is believed that Aboriginal Tasmanians became isolated from mainland Aboriginal groups around 11,700 years ago, when rising sea levels formed Bass Strait.

The Territory of Ashmore and Cartier Islands is an uninhabited Australian external territory consisting of four low-lying tropical islands in two separate reefs (Ashmore and Cartier), as well as the 12-nautical-mile (22 km; 14 mi) territorial sea generated by the islands. The territory is located in the Indian Ocean situated on the edge of the continental shelf, about 320 km (199 mi) off the northwest coast of Australia and 144 km (89 mi) south of the Indonesian island of Rote.

Ashmore Reef is called Pulau Pasir by Indonesians and Nusa Solokaek in the Rotenese language. Both names have the meaning "sand island".

The Coral Sea Islands Territory is an external territory of Australia which comprises a group of small and mostly uninhabited tropical islands and reefs in the Coral Sea, north-east of Queensland, Australia. The only inhabited island is Willis Island. The territory covers 780,000 km (301,160 sq mi), most of which is ocean, extending east and south from the outer edge of the Great Barrier Reef and includes Heralds Beacon Island, Osprey Reef, the Willis Group and fifteen other reef/island groups. Cato Island is the highest point in the Territory.

This is a list of selected Australian islands grouped by state or territory. Australia has 8,222 islands within its maritime borders.

Brisbane (/ˈbrɪzbən/ BRIZ-bən; Turrbal/Yagara: Meanjin, Meaanjin, Maganjin or Magandjin) is the capital and largest city of the state of Queensland and the third-most populous city in Australia, with a population of approximately 2.8 million. Brisbane lies at the centre of South East Queensland and is located roughly in the midpoint of Australia's eastern coastline. It is an urban agglomeration with a population of over 4 million. The central business district is situated within a peninsula of the Brisbane River about 15 km (9 mi) from its mouth at Moreton Bay. Greater Brisbane sprawls over the hilly floodplain of the Brisbane River Valley between Pacific Ocean and the Taylor and D'Aguilar mountain ranges, encompassing several local government areas, most centrally the City of Brisbane, the most populous local government area in Australia. The demonym of Brisbane is Brisbanite or Brisbaner.

The Moreton Bay penal settlement was founded in 1824 at Redcliffe as a place for secondary offenders from the Sydney colony, but in May 1825 moved to North Quay on the banks of the Brisbane River, so named for the Governor of New South Wales Sir Thomas Brisbane. German Lutherans established the first free settlement of Zion Hill at Nundah in 1838, and in 1859 Brisbane was chosen as Queensland's capital when the state separated from New South Wales. During World War II, the Allied command in the South West Pacific was based in the city, along with the headquarters for General Douglas MacArthur of the United States Army.

Queensland (locally /ˈkwiːnzlænd/ KWEENZ-land, commonly abbreviated as QLD) is a state in northeastern Australia, the second-largest and third-most populous state in Australia. It is bordered by the Northern Territory, South Australia and New South Wales to the west, south-west and south, respectively. To the east, Queensland is bordered by the Coral Sea and the Pacific Ocean; to the state's north is the Torres Strait, separating the Australian mainland from Papua New Guinea, and the Gulf of Carpentaria to the north-west. With an area of 1,723,030 square kilometres (665,270 sq mi), Queensland is the world's sixth-largest subdivision of any country on earth; it is larger than all but 16 countries. Due to its size, Queensland's geographical features and climates are diverse, and include tropical rainforests, rivers, coral reefs, mountain ranges and white sandy beaches in its tropical and sub-tropical coastal regions, as well as deserts and savanna in the semi-arid and desert climatic regions of its interior.

Queensland has a population of over 5.5 million, concentrated in South East Queensland, where nearly three in four reside. The capital and largest city in the state is Brisbane, Australia's third-largest city and comprising fully half of the state's population. Ten of Australia's thirty largest cities are located in Queensland, the largest outside Brisbane being the Gold Coast, the Sunshine Coast, Townsville, Cairns, Ipswich, and Toowoomba. 24.2% of the state's population were born overseas. The state has the highest inter-state net migration in Australia.