Auckland City is the part of Auckland urban area covering the isthmus and most of the islands of the Hauraki Gulf. The core of Auckland City is the Auckland CBD, a major financial and commercial centre, surrounded by many suburbs. It was formerly the name of a local authority district that was governed by Auckland City Council; it lay within the wider Auckland Region, which was governed by Auckland Regional Council. Auckland City was disestablished as a local government district on 1 November 2010, when Auckland City Council was amalgamated with other councils of the Auckland Region into the new Auckland Council.Auckland City was the most populous district in the country, with a population of 450,000 at 30 June 2010. In 2009, Auckland was rated the fourth-best place to live in the world, in human resources consultancy Mercer's annual survey.