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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 |
| 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 (13.125×109 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.