Tring Reservoirs is a group of four reservoirs close to Tring on the border of Hertfordshire and Buckinghamshire, England. Their purpose is to feed the Grand Union Canal. The four reservoirs are: Startops End, Marsworth, Tringford and Wilstone. The first three reservoirs adjoin each other, separated only by paths and roads; the fourth, Wilstone Reservoir, is a short distance to the west, close to the village of Wilstone. The reservoirs are a 106.5-hectare (263-acre) biological Site of Special Scientific Interest managed by the Herts and Middlesex Wildlife Trust.