This is a list of selected Australian islands grouped by State or Territory.
The states and territories are the first-level administrative divisions of the Commonwealth of Australia. They are the second level of government in Australia, located between the federal and local government tiers.
Australia has 8,222 islands within its maritime borders.
Australia, officially the Commonwealth of Australia, is a sovereign country comprising the mainland of the Australian continent, the island of Tasmania, and numerous smaller islands. It is the largest country in Oceania and the world's sixth-largest country by total area. The neighbouring countries are Papua New Guinea, Indonesia, and East Timor to the north; the Solomon Islands and Vanuatu to the north-east; and New Zealand to the south-east. The population of 25 million is highly urbanised and heavily concentrated on the eastern seaboard. Australia's capital is Canberra, and its largest city is Sydney. The country's other major metropolitan areas are Melbourne, Brisbane, Perth, and Adelaide.
The islands larger than 1,000 square kilometres (390 sq mi) are:
Tasmania is an island state of Australia. It is located 240 km (150 mi) to the south of the Australian mainland, separated by Bass Strait. The state encompasses the main island of Tasmania, the 26th-largest island in the world, and the surrounding 334 islands. The state has a population of around 526,700 as of March 2018. Just over forty percent of the population resides in the Greater Hobart precinct, which forms the metropolitan area of the state capital and largest city, Hobart.
The Northern Territory is an Australian territory in the central and central northern regions of Australia. It shares borders with Western Australia to the west, South Australia to the south, and Queensland to the east. To the north, the territory looks out to the Timor Sea, the Arafura Sea and the Gulf of Carpentaria, including Western New Guinea and other Indonesian islands. The NT covers 1,349,129 square kilometres (520,902 sq mi), making it the third-largest Australian federal division, and the 11th-largest country subdivision in the world. It is sparsely populated, with a population of only 246,700, making it the least-populous of Australia's six states and two territories, with fewer than half as many people as Tasmania.
Kangaroo Island is Australia's third-largest island, after Tasmania and Melville Island. It lies in the state of South Australia 112 km (70 mi) southwest of Adelaide. Its closest point to the mainland is Snapper Point in Backstairs Passage which is 13.5 km (8.4 mi) from the Fleurieu Peninsula.
Bare Island is a heritage-listed islet located in south-eastern Sydney, in La Perouse in the City of Randwick local government area in the state of New South Wales, in eastern Australia. The islet is located about 16 kilometres (9.9 mi) south east of the Sydney central business district, within Botany Bay, close to the bay's northern headland. Containing former fortification facilities, Bare Island was a former war veterans' home and museum and is now an historic site that was added to the New South Wales State Heritage Register on 2 April 1999 and is significant as an almost completely intact example of late nineteenth century coastal defence technology. It was designed by Sir Peter Scratchley, Gustave Morell and James Barnet and built from 1881 to 1889 by John McLeod on behalf of the NSW Department of Public Works.
The Bird Island Nature Reserve is a protected nature reserve located near Lake Munmorah on the Central Coast region of New South Wales, Australia. The island is situated 1.4 kilometres (0.87 mi) off the east coast of New South Wales, within the Tasman Sea. The reserve may be seen from the lighthouse at Norah Head.
Boondelbah Island, also known as the Boondelbah Nature Reserve, is a protected nature reserve and uninhabited island lying 2 kilometres (1.2 mi) off the mouth of Port Stephens on the coast of New South Wales, Australia. The 14-hectare (35-acre) reserve and island is one of two breeding sites of the nominate subspecies of the threatened Gould's petrel and, with the nearby Cabbage Tree Island which hosts the principal colony, has been classified by BirdLife International as an Important Bird Area. Both Boondelbah and Cabbage Tree Islands are gazetted nature reserves under the National Parks and Wildlife Act, 1974 (NSW), so protecting the islands' habitat from land uses incompatible with nature conservation. Access is only permitted for scientific and conservation purposes.
Bickerton Island is 13 km west of Groote Eylandt and 8 km east of the mouth of Blue Mud Bay in eastern Arnhem Land, in the Northern Territory of Australia. It is about 21 by 21 kilometres in size, with deep bays and indentations, and has an area of 215 km2. The largest bays are South Bay and North Bay. Bickerton Island was named by Matthew Flinders for Admiral Sir Richard Bickerton, Bt.
The Crocodile Islands are a group of islands belonging to the Yan-nhaŋu people of the Northern Territory of Australia. They are located off the coast of Arnhem Land in the Arafura Sea.
Croker Island is an island in the Arafura Sea off the coast of the Northern Territory, Australia, 200 km northeast of Darwin. It is separated from Cobourg Peninsula in the west by Bowen Strait, which is 2.5 km wide in the south and up to 7 km in the north, and 8.5 km long. In the north and east is the Arafura Sea, and in the south and southeast Mountnorris Bay. Croker Island measures 43 km from Point David to Cape Croker (north), up to 15 km wide, and has an area of 331.5 km². At its highest point it is only 15 m above sea level. Croker Island is the largest island, and the only permanently inhabited island, in the Croker Group.
Tasmania is a large island state off the south-east coast of mainland Australia. The main island of Tasmania (which includes 94% of the state's land area) does not have a defined name but can be referred to as the "Tasmanian mainland". There are 334 islands (or islets) within the state of Tasmania; 100 hectares (250 acres). A full list of all 334 islands is located at the list of islands of Tasmania.with the main islands listed below, each having a land area greater than
Over 1,000 islands have been gazetted – only the island groups and major islands are listed.
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, northeast of Queensland, Australia. The only inhabited island is Willis Island. The territory covers 780,000 km2 (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.
Long Island is an island and geographical area of New York state.
Broken Bay, a semi–mature tide-dominated drowned valley estuary, is a large inlet of the Tasman Sea located about 50 kilometres (31 mi) north of Sydney central business district on the coast of New South Wales, Australia; being one of the bodies of water that separate greater Metropolitan Sydney from the Central Coast. Broken Bay is the first major bay north of Sydney Harbour.
Port Stephens, an open youthful tide dominated drowned valley estuary, is a large natural harbour of approximately 134 square kilometres (52 sq mi) located in the Hunter Region of New South Wales, Australia.
Middle Harbour, a semi–mature tide dominated drowned valley estuary, is the northern arm of Port Jackson, an inlet of the Tasman Sea located north of Sydney central business district on the coast of New South Wales, Australia.
The Furneaux Group is a group of approximately 100 islands located at the eastern end of Bass Strait, between Victoria and Tasmania, Australia. The islands were named after British navigator Tobias Furneaux, who sighted the eastern side of these islands after leaving Adventure Bay in 1773 on his way to New Zealand to rejoin Captain James Cook. Navigator Matthew Flinders was the first Westerner to explore the Furneaux Islands group in the Francis in 1798, and later that year in the Norfolk.
The Sydney Basin is an interim Australian bioregion and is both a structural entity and a depositional area, now preserved on the east coast of New South Wales, Australia and with some of its eastern side now subsided beneath the Tasman Sea. The basin is named for the city of Sydney, on which it is centred.
Pittwater is a semi–mature tide dominated drowned valley estuary, located about 40 kilometres (25 mi) north of the Sydney central business district, New South Wales, Australia; being one of the bodies of water that separate greater Metropolitan Sydney from the Central Coast.
Trochus Island is an island of the Torres Strait Islands archipelago, located in the Great Barrier Reef Marine Park, east of Cape York Peninsula, in Queensland, Australia.
The Hunter Island, the main island of the Hunter Island Group, is a 7,330-hectare (18,100-acre) island, located in Bass Strait, that lies between King Island and north-west Tasmania, Australia.
The Bird Rock, part of the Waterhouse Island Group, is an uninhabited 1-hectare (2.5-acre) granite islet situated in Banks Strait, part of Bass Strait, lying close to the north-eastern coast of Tasmania, Australia.
The Great Dog Island, also known as Big Dog Island, and part of the Great Dog Group within the Furneaux Group, is a 354-hectare (870-acre) granite island, located in Bass Strait, lying south of the Flinders Island and north of the Cape Barren Island, in Tasmania, in south-eastern Australia.
The Ninth Island, part of the Waterhouse Island Group, is a 32-hectare (79-acre) uninhabited granite island situated in Bass Strait, lying close to the north-eastern coast of Tasmania, Australia.. In November 2018, it was listed for sale for the fourth time, at $1.98 million. The property for sale is a landlocked title within a conservation covenant, preventing access to the island by any means except helicopter.
The George Rocks, also historically known as King George’s Rocks, is part of the Waterhouse Island Group, a group of three adjacent uninhabited granite islets and associated reefs with a combined area of 7 hectares, situated in Banks Strait, part of Bass Strait, lying close to the north-eastern coast of Tasmania, Australia.
Louisa Island is an island with a short sandy tombolo, located adjacent to the south-western coast of Tasmania, Australia. The irregularly shaped 23-hectare (0.089 sq mi) island is part of the Maatsuyker Islands Group, and comprises part of the Southwest National Park and the Tasmanian Wilderness World Heritage Site.
The Wild Wind Islets comprise a group of five steep rocky unpopulated islets located close to the south-western coast of Tasmania, Australia. Situated some 2 kilometres (1.2 mi) south of where the mouth of Port Davey meets the Southern Ocean, the 3.95-hectare (9.8-acre) islets are one of the eight islands that comprise the Mutton Bird Islands Group. The Wild Wind Islets are part of the Southwest National Park and the Tasmanian Wilderness World Heritage Site.
The Adolphus Channel or the Albany passage is a channel located in the Torres Strait, situated northeast of the Cape York Peninsula, in Queensland, Australia. The channel runs north of the Albany Island, one of the islands if the Manar group of the Torres Strait Islands archipelago, and to the south of Mount Adolphus Island. Adolphus Channel is a major shipping route for traffic passing from the eastern coast of Australia to the Gulf of Carpentaria, Arafura Sea and regions further west. It is about 7 km across at its narrowest point, mostly less than about 20 m in depth and opens towards the west and towards the east. Submarine dunes up to 5 m tall migrate along the Adolphus Channel seabed, posing a potential risk to safe navigation.
The Geography of Franz Josef Land refers to an island group belonging to Arkhangelsk Oblast of Russia. It is situated in the Barents Sea of the Arctic, north of Novaya Zemlya and east of Svalbard. At latitudes between 80.0° and 81.9° north, it is the most northerly group of islands associated with Eurasia. The extreme northernmost point is Cape Fligely on Rudolf Island. The archipelago consists of 191 ice-covered islands with a total area of 16,134 km2 (6,229 sq mi). It is currently uninhabited. The archipelago is only 900 to 1,110 km from the North Pole, and the northernmost islands are closer to the Pole than any other land except for Canada's Ellesmere Island and Greenland. The largest island is Zemlya Georga which measures 110 km (68 mi) from end to end. The highest point in the archipelago is on Ostrov Viner-Neyshtadt which reaches 620 m (2,034 ft) above sea level. The central cluster of large islands in the midst of the archipelago forms a compact whole, known as Zichy Land, where islands are separated from each other by very narrow sounds that are frozen most of the year.
The Hogan Group is a collection of six islands and islets located in the Bass Strait that define part of the border between mainland Australia and the island state of Tasmania. Within the jurisdiction of Tasmania, the Hogan Group forms a land border between the states of Tasmania and Victoria. The island group is officially designated unallocated Crown land, within the Flinders Municipality in Tasmania and the South Gippsland Shire in Victoria.