Ruislip Lido is a reservoir and artificial beach in Ruislip, within the London Borough of Hillingdon,situated between Ruislip Common, Ruislip Woods (a Site of Special Scientific Interest),and Poors Field.
Originally opened as a feeder reservoir for the Grand Junction Canal in 1811, the reservoir was reopened in 1933 as a lido, with facilities for swimming and boating. A narrow gauge railway, the Ruislip Lido Railway was opened in 1945, and now runs about two thirds of the distance around the reservoir.
