Adelaide is the fifth most populous city in Australia, with a population of over 1.1 million in 2006,[2] and is the capital and most populous city of the state of South Australia. It is a coastal city situated on the eastern side of Gulf St. Vincent on the Adelaide Plains, north of the Fleurieu Peninsula, and west of the Mount Lofty Ranges, which rise to around 700 metres (2,300 ft).