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°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 range within the Brecon Beacons National Park. The lake is one of the largest glacial lakes in South Wales and is roughly rectangular in shape with its long axis oriented roughly north-south.
Drainage
The lake is enclosed within a rock hollow formed as a result of glacial action during the ice ages, especially the last ice age. There are moraines on the open side of the lake left by the ice, and they have helped to dam the water of the lake. It is drained by a stream known as Nant y Llyn (Welsh: 'stream of the lake'), whose waters flow into the River Tawe. The surface of Llyn y Fan Fawr lies at about 1815 feet or 605 m above sea level.[1] Much of the land around the Lake is peaty and thus wet underfoot.
Llyn y Fan Fach (Welsh: 'lake of the small peak') which lies about 2 miles (or 3 km) to the west is of similar origin and slightly smaller in size; it was dammed with a small increase in height of the lake in the 1930s to provide water for Llanelly .
Access
The lake can be reached on foot by a 2 mile walk (or about 3 km) across the peat moorland from the minor Trecastle to Abercrave road, where there is a small parking place. There is another small car park about 200 yards away to the south., which also marks the start of a footpath to the lake. The path crosses many small streams as well as peat bogs and needs some skill at navigation, especially when the path rises gently to the lake itself. The footpath meets the Beacons Way path just by the south end of the lake, from where it climbs the escarpment via a well graded stone slab staircase to Fan Brycheiniog and then Fan Foel on the leading edge of the cliffs. The views of the lake from the path are impressive, revealing its size in the landscape. All of the surrounding moorland is of open access but is often wet and rough underfoot. The footpath offers fast and safe progress although it is not always easy to find below the lake.
References
- ^ Ordnance Survey Explorer map OL12 'Brecon Beacons National Park: western area'