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Australia is a large island continent located in the southern hemisphere. It has a land area of approximately 7.7 million square kilometers and a population of around 25 million people. The capital city is Canberra, while the largest city is Sydney. Australia has a developed economy that is heavily reliant on mining, agriculture, and service industries. It is one of the world's wealthiest nations and has a high standard of living. English is the official language of Australia and is widely spoken by the majority of the population.