Melbourne is the more common name for the geographic region and statistical division of the Greater Melbourne metropolitan area. It is the second most populous city in Australia, with a population of approximately 3.8 million (2007 estimate) and serves as the state capital of Victoria. Melbourne is located on the lower reaches of the Yarra River and on the northern and eastern shorelines of Port Phillip and their hinterland. Before the arrival of European settlers, the area was occupied for an estimated 31,000 to 40,000 years by under 20,000 hunter-gatherers from three indigenous regional tribes. A tiny pastoral settlement established around the estuary of the Yarra (47 years after the first European settlement of Australia) was rapidly transformed into a wealthy metropolis by the Victorian gold rush and immigration. Between 1865 and 1902, Melbourne was Australia's largest and most important city. Marvellous Melbourne was also reputedly the richest in the world in the 1880s and according to The Statesman's Yearbook it was the second largest in the British Empire after London for most of the decade, a period in which the city hosted five international exhibitions including the 1880 International Exhibition recognised by the Bureau International des Expositions. Melbourne served as the seat of the federal government from the time of the new nation's federation in 1901, until Federal Parliament moved to the purpose-built capital, Canberra, in 1927.
In the 20th and 21st century Melbourne has hosted many international conferences and events, including the 1956 Summer Olympics and the 2006 Commonwealth Games. It was the location of the 1981 Commonwealth Heads of Government Meeting and the 2006 G20 summit.