Llyn y Fan Fawr
| Llyn y Fan Fawr | |
|---|---|
 |
|
| Location | Powys, Wales |
| Coordinates | 51°52′52″N 3°42′0″W / 51.88111°N 3.70000°WCoordinates: 51°52′52″N 3°42′0″W / 51.88111°N 3.70000°W |
| Type | natural |
| Primary outflows | River Tawe |
| Basin countries | United Kingdom |
| Surface elevation | 605 m (1815 feet) |
Llyn y Fan Fawr (Welsh: 'lake of the big peak') is a natural lake in the county of Powys, Wales. It lies at the foot of Fan Brycheiniog, the highest peak of the Black Mountain (WelshY Mynydd Du) range within the Brecon Beacons National Park. Created as a result of glacial action, it is one of the largest glacial lakes in southern Wales. The lake is roughly rectangular in shape with its long axis oriented roughly north-south.
The surface of Llyn y Fan Fawr lies at about 1815 feet or 605m above sea level. Its primary outflow is to the River Tawe. Much of the land around the lake is peaty and thus wet underfoot.
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