Solo Diving Brecon Beacons Highest Lake in Winter

Dive trip reports Mountain Stuff

Another short video I created in the Brecon Beacons Mountains was last week on the 12th Jan, three of us, walked up the Northern side of Corn Du and Pen Y Fan to the highest lake in the Brecon Beacons – Llyn Cwm Llwch at 585mtr.

We mixed in the two passions in my life which is Diving and Mountaineering. As such, I did a solo dive of the this lake.

Llyn Cwm Llwch is a small lake or pool in the Brecon Beacons National Park in Powys, Wales. It is between 1 and 2 acres: much smaller than the two glacial lakes in the west of the Black Mountain (range): Llyn y Fan Fawr and Llyn y Fan Fach. It is 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 a large curved late-glacial moraine.

The lake is within open country and readily accessible to walkers. A popular path up to Pen y Fan runs southwards up Cwm Llwch, passing by the outlet of the lake. The lake 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.

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