Aldenham Country Park

Aldenham Country Park is a 175-acre (0.71 km2) parkland and woodland, including Aldenham Reservoir. It is now part of the Watling Chase Community Forest, near Elstree, Hertfordshire, England.Aldenham Reservoir was excavated by French prisoners of war in 1795 to help maintain local river levels after the Grand Union Canal was built.

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 (260,000 m2) in extent, but following repairs to the dam its surface area is now 55 acres (220,000 m2). It was built between 1795 and 1797 by the Grand Junction Canal Company, to control the water levels in the River Colne following the construction of the Grand Junction Canal, and was hand dug by French prisoners of war.