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 population of 26 million is highly urbanized 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.
Australia is a highly developed country, with the world’s 14th-largest economy. It has a high-income economy, with the world’s tenth-highest per capita income. It is a regional power and has the world’s 13th-highest military expenditure. Australia has the world’s eighth-largest immigrant population, with immigrants accounting for 29% of the population. Having the third-highest human development index and the eighth-highest ranked democracy globally, the country ranks highly in quality of life, health, education, economic freedom, civil liberties, and political rights, with all its major cities faring well in global comparative livability surveys. Australia is a member of the United Nations, G20, Commonwealth of Nations, ANZUS, Organisation for Economic Co-operation and Development (OECD), World Trade Organization, Asia-Pacific Economic Cooperation, Pacific Islands Forum, and the ASEAN Plus Six mechanism.
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Australia is colloquially known as ``the Land Down Under`` (or just ``Down Under``), which derives from the country's position in the Southern Hemisphere, at the antipodes of the United Kingdom.
Metropolitan areas with more than one million inhabitants are Sydney, Melbourne, Brisbane, Perth and Adelaide.