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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.〔Nuttall, John & Anne (1999). The Mountains of England & Wales - Volume 1: Wales (2nd edition ed.). Milnthorpe, Cumbria: Cicerone. ISBN 1-85284-304-7.〕
Its highest point at 2379 feet (or 725 m) 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.〔Ordnance Survey Explorer map OL12 'Brecon Beacons National Park: western area'〕
== Geology ==
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 peak of Fan Fraith. The Cribarth Disturbance, a north-east to south-west aligned zone of faulting and folding, passes though the hill. The hill's finest feature is its north-eastern cwm which held a small glacier during the ice ages. The hill is within the Fforest Fawr Geopark designated in 2005 in recognition of the area's geological heritage.〔British Geological Survey 1:50,000 map sheet 231 'Merthyr Tydfil' & accompanying memoir〕
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