Sulby Reservoir is the largest reservoir

Reservoir

A reservoir , artificial lake or dam is used to store water.Reservoirs may be created in river valleys by the construction of a dam or may be built by excavation in the ground or by conventional construction techniques such as brickwork or cast concrete.The term reservoir may also be used to...

 or lake

Lake

A lake is a body of relatively still fresh or salt water of considerable size, localized in a basin, that is surrounded by land. Lakes are inland and not part of the ocean and therefore are distinct from lagoons, and are larger and deeper than ponds. Lakes can be contrasted with rivers or streams,...

 in the Isle of Man

Isle of Man

The Isle of Man , otherwise known simply as Mann , is a self-governing British Crown Dependency, located in the Irish Sea between the islands of Great Britain and Ireland, within the British Isles. The head of state is Queen Elizabeth II, who holds the title of Lord of Mann. The Lord of Mann is...

. It is located in Sulby Glen

Sulby Glen

Sulby Glen is a wooded glen in Sulby, Isle of Man through which the Sulby River flows from the Sulby Reservoir to Ramsey....

 near the source of the Sulby River

River Sulby

River Sulby can refer to one of two rivers on the Isle of Man:* The longest river on the Island, rising on Snaefell near the Sulby Reservoir and running north through Sulby Glen and then east for 18 kilometres before reaching the coast at Ramsey....

, the longest river

River

A river is a natural watercourse, usually freshwater, flowing towards an ocean, a lake, a sea, or another river. In a few cases, a river simply flows into the ground or dries up completely before reaching another body of water. Small rivers may also be called by several other names, including...

 on the island. Sulby Reservoir is also about 1 miles (1.6 km) west of the summit of Snaefell

Snaefell

Snaefell is the highest mountain and the only summit higher than on the Isle of Man, at above sea level. The summit is crowned by a train station, cafe, and several communications masts.- Views :...

, the island's highest peak. It is operated by the Isle of Man Water Authority

Isle of Man Water Authority

The Isle of Man Water and Sewerage Authority is the Statutory Board responsible for water supply and sewage disposal in the Isle of Man. It was formed in 1972 as the 'Isle of Man Water Authority' by the merger of the Isle of Man Water Board and the Water Department of Douglas Corporation...

.

The reservoir's dam was completed in 1982. Its height is 60 metres (196.9 ft).