Central London covers the widest area of London and houses some of the best known tourist attractions in the world. Despite the fact that more people live outside of Central London than in it, for many people Central London is London. Although many will argue what constitutes Central London, it is best described as the area bounded by the London Underground's Central Line and covered by Zone 1. This is a massive area that covers Notting Hill, Earls Court, Knightsbridge, Oxford Street, Chelsea and the commercial districts of Holborn, Clerkenwell and Bloomsbury. It covers the City of Westminster as well as the South Bank, Waterloo, North Lambeth and Southwark.