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-cae, Wrexham the Primitive Methodist chapel in Copperas. Coal was extracted from pits at Plas Bennion, Wynn Hall, Afon Eitha, Cristionydd, Groes and Plas Isaf; zinc was worked at Copperas. The area descending towards Acrefair was known as "The Delph", it was served by extensions of the Ruabon Brook Tramway but these were mostly defunct by the mid-20th century. Most inhabitants find employment outside the village in Wrexham with only a few local shops or public buildings providing jobs. "Dee Valley Water" operates two reservoirs in Pen-y-cae: "Pen-y-cae Upper" and "Pen-y-cae Lower". Wright & Son, ran a bus service from Pen-y-cae to