Federal and territory government agencies divide the Northern Territory of Australia into different administrative regions of the Northern Territory, though the names and boundaries vary. The federal Bureau of Statistics defines nine 'level 3' statistical areas (SA3s) within the Territory. Four of these – Darwin City, Darwin Suburbs, Palmerston and Litchfield – make up the Darwin metropolitan area and together account for more than half the Territory's population. Outside of the capital are the SA3s of Daly–Tiwi–West Arnhem, East Arnhem, Katherine, Barkly and Alice Springs.