Brisbane is the capital and largest city of the state of Queensland and the third-most populous city in Australia, with a population of approximately 2.8 million. Brisbane lies at the centre of South East Queensland, an urban agglomeration with a population of over 4 million. The central business district is situated within a peninsula of the Brisbane River about 15 km from its mouth at Moreton Bay. Brisbane’s metropolitan area sprawls over the hilly floodplain of the Brisbane River Valley between Moreton Bay and the Taylor and D’Aguilar mountain ranges, encompassing several local government areas, most centrally the City of Brisbane. The demonym of Brisbane is Brisbanite. The Moreton Bay penal settlement was founded in 1824 at Redcliffe as a place for secondary offenders from the Sydney colony, but in May 1825 moved to North Quay on the banks of the Brisbane River, so named for the Governor of New South Wales Sir Thomas Brisbane.