The Commonwealth of Australia, commonly known as Australia, is a parliamentary constitutional monarchy country located in the central and northern southern hemisphere and eastern eastern hemisphere. The whole country It belongs to Oceania, the country with the largest area in Oceania, the second largest in the southern hemisphere, and the sixth largest in the world. Australia's territory includes the entire Australian mainland, Tasmania and Christmas Island and other overseas islands, with a total land area of ββ7,692,300 square meters. Kilometers, similar to the area of ββthe United States. According to the 2019 census, the country has a population of about 25.22 million, ranking 54th in the world. The country has no land neighbors, and all neighboring countries are across the sea. Among them is New Zealand in the southeast. Kingdom; the northeast is Papua New Guinea, Vanuatu, Fiji and other Pacific island countries; the north and northwest are Southeast Asian countries such as Indonesia and East Timor. The capital of Australia is Canberra, the largest city is Sydney, and the mainland is divided into six states and two territories. The cities include Melbourne, Perth and Brisbane. In terms of economic and social development, they belong to developed countries and capitalist countries. The domestic currency issued and circulating is the Australian dollar, which is the fifth largest currency in circulation in the world.