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 Lake District, region of mountains and lakes, c.30 mi (50 km) in diameter, NW England. It includes the Cumbrian Mts. and part of the Furness peninsula. The district comprises 15 lakes, among them Ullswater, Windermere, Derwentwater, and Bassenthwaite; several
..... Click the link for more information. to Solway Firth.

Derwent Water

Lake, Cumbria, England. Located in the Lake District, it is about 3 mi (5 km) long and 0.5–1.25 mi (0.8–2 km) wide, with a maximum depth of 72 ft (22 m). The River Derwent enters its southern end and leaves the lake's northern end near the market town of Keswick. Several sites on its shores are National Trust property and are frequented by tourists. Lords Island, one of several in the lake, was once the residence of the earls of Derwentwater.