Manchester (local //) is a city and metropolitan borough in North West England with a population of 510,700 (2012 est.,). Since 2001, population has grown by 20.8% (87,900), making it the fastest growing city in Britain. It lies within the United Kingdom's second most populous urban area which has a population of 2,553,379. Manchester is located in the south-central part of North West England, fringed by the Cheshire Plain to the south and the Pennines to the north and east, and an arc of towns with which it forms a continuous conurbation. The local authority is Manchester City Council, and the city's inhabitants are referred to as Mancunians //.