Ten nations competed in water polo at the 1956 Summer Olympics in Melbourne. The event was open only to men's teams.Melbourne is the capital and most populous city in the state of Victoria, and the second most populous city in Australia, after Sydney. The Melbourne City Centre (also known as the "Central Business District" or "CBD"[5]) is the hub of the greater geographical area (or "metropolitan area") and the Census statistical division of which "Melbourne" is the common name. As of June 2009, the greater geographical area had an approximate population of four million. Inhabitants of Melbourne are called Melburnians.