Derwent Water, lake, 3 mi (4.8 km) long and 1 mi (1.6 km) wide, Cumbria, NW England, formed by a widening of the River Derwent. It is surrounded by wooded hills, with the Lodore (c.90 ft/27 m) and Barrow (c.108 ft/33 m) waterfalls at its upper end. Its islands include Lord's Isle, site of the former mansion of the earls of Derwent; Isle of St. Herbert (a 7th-century hermit); and Floating Island, a mass of vegetation, sometimes inundated. The River Derwent flows NW through the Lake District to Solway Firth.
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