Llyn y Fan Fach 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 several prominent mountain peaks, especially Picws Du and Waun Lefrith.
Chwarel y Fan Chwarel y Fan Chwarel y Fan is a peak in the Black Mountains in south-eastern Wales. It is the highest rise on the long ridge which extends southeastwards from Rhos Dirion. The ridge continues southeastwards to the lesser summit of Bal-Mawr whose top is adorned by a trig point at above sea level. A further 1 km southeast along the ridge is the lesser top of Bal-Bach at a height of just over . Chwarel y Fan is the county top of the historic county of Monmouthshire, and is also the highest point in the current local government area of