South Australia

South Australia (commonly abbreviated as SA) is a state in the southern central part of Australia. With a total land area of 984,314 square kilometres (380,046 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. With 1.9 million people as of June 2025, it is the 17th-largest subdivision in the world and the fifth-largest in Australasia. It is the second-most highly centralised state 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; with Mount Gambier being the second-largest centre, with 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.

The state comprises less than 6.7% of the Australian population and ranks fifth in population among the six states and two territories. The majority of its people reside in greater Metropolitan Adelaide. Most of the remainder are settled in fertile areas along the south-eastern coast and River Murray. The state's colonial origins are unique in Australia as a freely settled, planned British province, rather than as a convict settlement. Colonial government commenced on 28 December 1836, when the members of the council were sworn in near the Old Gum Tree.

As with the rest of the continent, the region has a long history of human occupation by numerous groups and languages. The South Australian Company established a temporary settlement at Kingscote, Kangaroo Island, on 26 July 1836, five months before Adelaide was founded. The guiding principle behind settlement was that of systematic colonisation, a theory espoused by Edward Gibbon Wakefield that was later employed by the New Zealand Company. The goal was to establish the province as a centre of civilisation for free immigrants, promising civil liberties and religious tolerance. Although its history has been marked by periods of economic hardship, South Australia has remained politically innovative and culturally vibrant. Today, it is known for its fine wine and numerous cultural festivals. The state's economy is dominated by the agricultural, manufacturing and mining industries.