Newcastle, also known as Greater Newcastle, colloquially as Newy and the Steel City, is a large metropolitan area and the second-most-pop…Newcastle, also known as Greater Newcastle, colloquially as Newy and the Steel City, is a large metropolitan area and the second-most-populous city of New South Wales, Australia. It includes the cities of Newcastle and Lake Macquarie and it is the hub of the Lower Hunter region, which includes most parts of the cities of Newcastle, Lake Macquarie, Maitland, Cessnock, and Port Stephens Council.