Waun Lefrith
| Waun Lefrith | |
|---|---|
 Waun Lefrith from Picws Du | |
| Highest point | |
| Elevation | 677 m (2,221 ft) |
| Prominence | 15 m (49 ft) |
| Parent peak | Picws Du |
| Listing | Nuttall |
| Coordinates | 51°52′47″N 3°44′57″W / 51.8796°N 3.7492°W |
| Naming | |
| English translation | milk bog |
| Language of name | Welsh |
| Geography | |
 | |
| Location | Carmarthenshire, Wales |
| Parent range | Brecon Beacons |
| OS grid | SN825217 |
Waun Lefrith is a top of Picws Du and is also the westernmost of the Carmarthen Fans or Bannau Sir Gaer, a group of peaks within the Black Mountain of the Brecon Beacons National Park. It lies within the county of Carmarthenshire. The summit plateau of the mountain reaches a height of 2221 feet above sea level. Picws Du is the other, higher summit of the Bannau Sir Gaer / Carmarthen Fans.[1] The glacial lake of Llyn y Fan Fach is visible in the panorama to the north of the peak.
Geology
Waun Lefrith is formed from the sandstones and mudstones of the Brownstones Formation of the Old Red Sandstone laid down during the Devonian period. Its southern slopes are formed from the hard-wearing sandstones of the overlying Plateau Beds Formation which are of upper/late Devonian age. The northern face of Waun Lefrith was home to a glacier during the ice ages which gouged out the cwm in which Llyn y Fan Fach now sits. This empties via the Afon Sawdde into the River Towy. The southern slopes drain via the Twrch Fechan, the Nant Menyn and Nant Lluestau into the Afon Twrch and so into the River Tawe.[2]
Access
The entire mountain is open country and so freely accessible to walkers. The most popular path of ascent is that from the car park at the foot of the water board track running steeply up to Llyn y Fan Fach and over which lake the mountain looms. It is near to the small village of Llandeusant. The high level route of the Beacons Way from Llangadog to Abergavenny runs over Waun Lefrith whilst the low level route runs along the foot of its northern escarpment to the small glacial lake of Llyn y Fan Fach. Most of the upper part of the mountain is covered with peat bogs, but the footpath is protected at many points by stone pavements.