The River Pool is a tributary of the River Ravensbourne. It is 5.1 km (3 miles) in length, and rises (with its tributaries) between Shirley and West Wickham in the London Borough of Croydon. It then flows northwards through Beckenham (London Borough of Bromley) and Sydenham in the London Borough of Lewisham, to join the Ravensbourne in Catford.