Brisbane is the capital and largest city of the Australian 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; a bio-geographical and urban region with an estimated population of 4.1 million as of 2024. The central business district is situated within a peninsula of the Brisbane River approximately 15 km (9 mi) from its mouth at Moreton Bay. Greater Brisbane sprawls across the hilly floodplain of the Brisbane River Valley between the Pacific Ocean and the Taylor and D'Aguilar mountain ranges, encompassing several local government areas (LGAs). The City of Brisbane LGA forms the inner area of Greater Brisbane, and is the most populous local government area in Australia. The city is governed by Brisbane City Council, composed of 26 locally-elected councillors and led by a lord mayor. The demonym of Brisbane is Brisbanite.