Llyn Cwm Llwch both Pen y Fan and Corn Du and indeed from the spur of Pen Milan to its west. Llyn Cwm Llwch 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
Pen-y-clawdd with the inscription "Success to this City". A major restoration of the church was undertaken in 1885/86 and included the raising of the tower by about and the removal of chancel benches, the nave box pews and benches, and the two-decker pulpit and reading desk. A sepulchral slab, dated from the 14th Century, was discovered at this time. Pen-y-clawdd House, a third of a mile south-east of the village, is described by Newman as "notable only for the plain but nobly scaled red brick arch, dated May 1861." Pen-y-clawdd Pen-y-clawdd is a village in Monmouthshire, south east Wales, situated between