Aldenham Reservoir
 Aldenham Reservoir is situated in the parish of Elstree and Borehamwood in Hertfordshire England about one mile (1.6 km) to the west of the village of Elstree.Originally it was 65 acres (260000 m2) in extent [now 55 acres (220000 m2) after repairs to the dam] and was built by the Grand Union Canal Company to control the water levels in the River Colne following the construction of the Grand Union Canal.