South East Queensland (SEQ) is a bio-geographical, political, and administrative region of the state of Queensland in Australia, which contains more than 3.6 million people out of the state's population of 5.1 million. The area covered by South East Queensland varies, depending on the definition of the region, though it tends to include Queensland's three largest cities: the capital city Brisbane; the Gold Coast; and the Sunshine Coast. Its most common use is for political purposes, and covers and incorporates 11 local government areas, extending from Noosa in the north to the Gold Coast and New South Wales border in the south (some sources include Tweed Heads (NSW) which is contiguous as an urban area with Brisbane/Gold Coast), and west to Toowoomba (which is simultaneously considered part of the Darling Downs region).