Australia (, , colloquially ), officially known as the Commonwealth of Australia, is an Oceanian country comprising the mainland of the Australian continent, the island of Tasmania, and numerous smaller islands. It is the world's sixth-largest country by total area. Neighbouring countries include 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.

Australians , colloquially known as Aussies , are a people associated with the continent of Australia, sharing a common history, culture, and language (Australian English). Present-day Australians are citizens of the Commonwealth of Australia, governed by its nationality law.