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Devoke Water is a small lake in the south west of the Lake District in North West England. It is the largest tarn in the Lake District, a tarn being a specific type of glacial lake formed when a hollow is created on a mountain. The lake is 1.17 kilometres (0.73 mi) long, has an area of 0.34 square kilometres (0.13 sq mi) and lies at an altitude of 236 metres (774 ft) on Birker Fell. Its outflow, to the north west, is Linbeck Gill, which joins the River Esk before flowing into the Irish Sea at Ravenglass. The lake is in the unitary authority of Cumberland and the ceremonial county of Cumbria. Its south-western shore forms part of the south-western boundary of Eskdale parish, in which it is situated. Devoke Water can be reached via a bridle track. There is a two-storey stone boathouse-cum-refuge and a ruined stable. The fishing rights to the lake are owned by Millom Anglers and it is stocked with brown trout. It also holds perch.