Llyn Cwm Llwch
|Llyn Cwm Llwch|
Wild camping at Llyn Cwm Llwch
|Primary outflows||Nant Cwm Llwch|
|Basin countries||United Kingdom|
Llyn Cwm Llwch is a lake in the Brecon Beacons National Park in Powys, Wales. It is a small lake of glacial origin occupying a rock hollow beneath the peaks of Pen y Fan and Corn Du in the central Brecon Beacons. It is drained by the Nant Cwm Llwch which empties into the Afon Tarell which itself enters the River Usk at Brecon. Tommy Jones' obelisk, a memorial in granite to a young boy who died near this spot in 1900, overlooks the lake.
The lake occupies a hollow excavated in the sandstones of the Brownstones Formation of the Old Red Sandstone by glacial action during the succession of recent ice ages. Its northern margins are rimmed by an arcuate late-glacial moraine.
The lake is within open country and readily accessible to walkers. A popular path up to Pen y Fan runs up Cwm Llwch from Llwynybedw, passing by the outlet of the lake. It is seen to advantage from the peaks of both Pen y Fan and Corn Du and indeed from the spur of Pen Milan to its west.
- Ordnance Survey Explorer map OL12 'Brecon Beacons National Park: western area'
- British Geological Survey 1:50,000 map sheet 231 'Brecon' & accompanying sheet explanation
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