Llyn y Fan Fach of the Lady of the lake in Welsh and English. Llyn y Fan Fach Llyn y Fan Fach (Welsh meaning "Lake of the small hill") is a lake of approximately 10 hectares on the northern margin of the Black Mountain in Carmarthenshire, South Wales and lying within the Brecon Beacons National Park. The lake lies at an altitude of approximately , immediately to the north of the ridge of the Carmarthen Fans. It is the smaller of two lakes within this mountain massif: the slightly larger Llyn y Fan Fawr is about to the east. The lake is overlooked by
Pen-y-ghent summit. The more direct route that traverses the southern 'nose' of the hill is the route usually taken by those attempting the Yorkshire Three Peaks Challenge, as the walk is usually (but not exclusively) done in an anti-clockwise direction starting and finishing in Horton in Ribblesdale. The other main hillwalking route on the hill heads north from the summit to reach Plover Hill before descending to join Foxup Road, a bridleway at the head of Littondale. Pen-y-ghent is one of the mountains on the Yorkshire Three Peaks route. Pen-y-Ghent is made up of a millstone grit top sat upon a