Colley Hill is part of the North Downs escarpment in the North Downs, Surrey, England. It is about 1 km east of Buckland Hills and 1 km west of Reigate Hill, all of which form part of the same escarpment. It is centred 30 kilometres (19 mi) south of London and forms a single scarp with Reigate Hill, peaking 2 miles (3 km) away at 235 metres above sea level. The scarp fluctuates in height but is continuous as far as Box Hill 5 miles (8 km) west. The term "Reigate Hill" also designates a neighbourhood of Reigate, and also a ward of Reigate and Banstead.