East and West Warwick Reservoir - Walthamstow

East and West Warwick Reservoir located in the London Borough of Waltham Forest at Walthamstow. The storage reservoir is part of the Lee Valley Reservoir Chain and supplies drinking water to London. The reservoir was constructed on marshland in the mid–19th century. The reservoir is part of the Walthamstow Reservoirs Site of Special Scientific Interest, particularly favoured by the tufted duck. The reservoir is popular with birdwatchers, naturalists and anglers, but access is by permit only.