The London Borough of Croydon is a London Borough. It is in south London. The borough is the farthest south of Greater London, with the M25 circle motorway touching it at the bottom. In North Croydon the borough mainly borders the London Borough of Bromley to the east as well as the London Boroughs of Southwark and Lambeth to the north. The boroughs of Sutton and Merton are west of Croydon.