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-Pass youth hostel operated by YHA, and opposite is an information centre and café and a Snowdonia National Park-run car park. There is also a car park at the foot of the Llanberis Pass at Nant Peris as well as others in Llanberis village. There is a park and ride bus service to Pen-y-pass car park, which is the hub of the year-round Sherpa bus network provided by Express Motors and GHA Coaches. This service links Pen-y-Pass to Llanberis, Capel Curig, Betws-y-Coed, Beddgelert, Porthmadog, Rhyd Ddu and Waunfawr. Pen-y-Pass Pen-y-Pass is a mountain pass in Snowdonia, Gwynedd, north-west Wales. It is