The London Borough of Sutton (pronunciation) is an Outer London borough in south-west London, England. It covers an area of 43 km2 and is the 80th largest local authority in England by population. It borders the London Borough of Croydon to the east, the London Borough of Merton to the north and the Royal Borough of Kingston upon Thames to the north-west; it also borders the Surrey boroughs of Epsom and Ewell to the west and Reigate and Banstead to the south. The local authority is Sutton London Borough Council. Its principal town is the eponymous Sutton.