Box Hill, approximately south-west of central London, stands at the south-eastern corner of the Mole Gap, the valley carved by the River Mole through the North Downs. Its summit, above Ordnance Datum, is the 12th highest in Surrey. The western boundary of the hill is defined by the River Mole, which has cut a steep cliff, exposing the chalk bedrock. The Vale of Holmesdale lies immediately to the south, below the scarp slope. The northern and eastern boundaries are defined by dry river valleys, which were created during the last Ice Age. The total area of the hill is approximately , of which half is owned by the National Trust.