Australia is a federation consisting of six states, three federal territories and seven external territories. The Australian mainland consists of five of the six federated states (with the sixth state, Tasmania, being located on an island in close proximity to the mainland) and three federal territories (including the small, somewhat anomalous Jervis Bay Territory) which constitute the world's sixth-largest country by total area. In addition, there are six island territories, known as external territories. Three of the external territories are inhabited, and the other three, besides non-permanent scientists, are uninhabited. Australia additionally claims part of Antarctica as the Australian Antarctic Territory.