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Startopsend Reservoir was opened in 1817 to provide water for the Grand Junction Canal (now the Grand Union Canal). All but the section of the reservoir adjacent to the Marsworth Reservoir dam are in SP9113. Most of Startopsend Reservoir is in Hertfordshire, but the northernmost part is in Buckinghamshire. It differs from the other reservoirs in the area in that it has very little natural vegetation. It has the Marsworth Reservoir dam on its eastern flank, plus the road on the Tringford Reservoir dam. The Northern edge separates it from the Grand Union Canal and the South West and North West sides are also dams. It takes the overflow water from Marsworth and Tringford Reservoirs and has no direct supply of water.