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 607 metres (1,991 ft) above sea level. A further 1km southeast along the ridge is the lesser top of Bal-Bach at a height of just over 520 metres (1,710 ft).