Lake Vyrnwy

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Lake Vyrnwy
Welsh: Llyn Efyrnwy
View overlooking Lake Vyrnwy showing the full extent of the lake
Lake Vyrnwy
Location	Wales
Coordinates	52°47′N 3°30′W / 52.78°N 3.50°W / 52.78; -3.50
Lake type	Reservoir
Primary inflows	River Vyrnwy and other small streams
Primary outflows	River Vyrnwy
Managing agency	Hafren Dyfrdwy subsidiary of Severn Trent
Built	1881–88
Max. length	7.64 kilometres (4.75 mi)
Max. width	0.80 kilometres (0.5 mi)
Surface area	4.54 square kilometres (1,121 acres)
Max. depth	26 metres (84 ft)
Water volume	59.7 gigalitres (13.125×10^9 imp gal)
Shore length1	19 kilometres (12 mi)
1 Shore length is not a well-defined measure.

Lake Vyrnwy (Welsh: Llyn Efyrnwy, pronounced [ɛˈvərnʊɨ] or Llyn Llanwddyn) is a reservoir in Powys, Wales, built in the 1880s for Liverpool Corporation Waterworks to supply Liverpool with fresh water. It flooded the head of the Vyrnwy (Welsh: Afon Efyrnwy) valley and submerged the village of Llanwddyn.

The Lake Vyrnwy Nature Reserve and Estate that surrounds the lake is jointly managed by the Royal Society for the Protection of Birds (RSPB) and Hafren Dyfrdwy and is a popular destination for ornithologists, cyclists and hikers. The reserve is designated as a national nature reserve, a Site of Special Scientific Interest, a Special Protection Area, and a Special Area of Conservation.