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Fan Hir
Fan Hir is a peak at the eastern end of the Black Mountain (''Y Mynydd Du'') in the Brecon Beacons National Park (''Parc Cenedlaethol Bannau Brycheiniog'') in southern Wales. It is a subsidiary summit of Fan Brycheiniog. It falls within the county of Powys and is also a part of the traditional area of Fforest Fawr. Its Welsh name means "long peak", a fitting description, particularly if seen from the east when its steep eastern face is seen to advantage. It is about 2.5 miles or 4 km long and faces east. Its summit is 2490 feet (about 760m) above sea level. Fan Hir is separated from its higher neighbour to the north-west, Fan Brycheiniog (2633 feet or 802 metres) by a col known as Bwlch Giedd, where the Beacons Way path rises from Llyn y Fan Fawr via a stone staircase.〔Nuttall, John & Anne (1999). The Mountains of England & Wales - Volume 1: Wales (2nd edition ed.). Milnthorpe, Cumbria: Cicerone. ISBN 1-85284-304-7.〕
The hill is drained to east and north by streams which make their way into the River Tawe.〔Ordnance Survey Explorer map OL12 'Brecon Beacons National Park: western area'〕
== Geology ==
The peak is formed from sandstones of the Brownstones Formation and the overlying Plateau Beds Formation of the Old Red Sandstone laid down during the Devonian period. In accord with a regional trend, the beds dips southwards into the South Wales Coalfield basin.
A notable feature of the hill is the prominent ridge of Fan Fechan (the 'little peak') which parallels the main ridge below it to the east. It is largely composed of broken Old Red Sandstone and has been interpreted as either a glacial moraine or as a pro-talus rampart. The peak 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 213 'Merthyr Tydfil' & accompanying memoir〕
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