The Royal Borough of Kingston upon Thames is a borough in southwest London. The main town is Kingston upon Thames and it includes Chessington, Malden Rushett, New Malden, Surbiton and Tolworth. It is the oldest of the four royal boroughs in England. The others are Windsor and Maidenhead, the site of Windsor Castle, and the London boroughs of Greenwich, and Kensington and Chelsea. The local authority is Kingston upon Thames London Borough Council.