Fan Gyhirych

Fan Gyhirych is a mountain in the Fforest Fawr section of Brecon Beacons National Park in south Wales. It lies within the county of Powys, formerly Brecknockshire. Its highest point at 725m is marked by a trig point which is located towards the western side of the summit plateau. The hill drains to the north into the catchment of the Afon Crai and to the south and west into that of the River Tawe. Fan Fraith is a nearby hill which can be considered a subsidiary top of Fan Gyhirych. The hill is formed largely from sandstones of the Brownstones Formation of the Old Red Sandstone laid down during the Devonian period. A part of the summit plateau is capped by sandstones of the overlying Plateau Beds Formation which also occur on the nearby...