| Usk Reservoir | |
|---|---|
 | |
  Usk Reservoir | |
| Location | Wales |
| Coordinates | 51°56′40″N 3°42′50″W / 51.94444°N 3.71389°W |
| Type | reservoir |
| Primary inflows | River Usk |
| Primary outflows | River Usk |
| Basin countries | United Kingdom |
| Surface elevation | 1,006 ft (307 m) |
The Usk Reservoir (Welsh: Cronfa Wysg) is located in the upper Usk Valley, at 1,006 feet (307 m) above sea level, in the western part of the Brecon Beacons National Park, Wales. The county boundary between Carmarthenshire and Powys runs through the reservoir which lies about six miles to the north of the Black Mountain escarpment. It is an important landmark for walkers on the mountain range.
