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°WCoordinates: 51°52′47″N 3°44′57″W / 51.8796°N 3.7492°W |
| Naming | |
| Translation | milk bog (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 (Y Mynydd Du) of the Brecon Beacons National Park (Parc Cenedlaethol Bannau Brycheiniog). It lies within Carmarthenshire, Wales. The summit plateau of the mountain reaches a height of 2221 feet above sea level. Picws Du and Fan Foel are the other, higher summits of the Bannau Sir Gaer / Carmarthen Fans. The glacial lake of Llyn y Fan Fach dominates the panorama to the north of the peak. Beyond the lake to the north lies the Usk Reservoir and then the Cambrian Mountains on the horizon. Swansea Bay and the Bristol Channel are visible to the south across the undulating dip slope of the mountain. The Tywi valley lies to the west, with Llandovery and Llandeilo as important market towns nearest to the hills.
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. It is those rocks which form vertical crags along the top edge of the scarp. 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. Large moraines occur to the east of the summit at the base of the scarp, and below the prominent peak of Picws Du as well as those damming the Lake.
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Wikipedia