Australia is located in the Southern Hemisphere and is the smallest continent at around 8.7 million square kilometers. Its population is around 24.7 million people and its official language is English. Some of its major cities include Sydney, Melbourne, Brisbane, and Canberra, which is the capital city. Popular sights include the Sydney Opera House, Bondi Beach, the Great Barrier Reef, and Uluru. Aboriginal Australians have lived in the country for over 50,000 years and their traditional dance is called a haka. English is the dominant language although around 23% of the population was born overseas, reflecting Australia's diversity of cultures.