Fan Bwlch Chwyth
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| Fan Bwlch Chwyth | |
|---|---|
 Fan Bwlch Chwyth viewed from the south | |
| Highest point | |
| Elevation | 603 m (1,978 ft) |
| Prominence | 27.8 m (91 ft) |
| Coordinates | 51°52′57″N 3°34′53″W / 51.88250°N 3.58139°W |
| Geography | |
 | |
| Location | Powys, Wales |
| Parent range | Brecon Beacons |
| OS grid | SN912217 |
Fan Bwlch Chwyth is a peak in the Fforest Fawr section of the Brecon Beacons National Park and within the county of Powys.
Its summit (at 603 m) is marked by a trig point at OS grid ref SN 912217.[1]
The hill is formed from sandstones and mudstones of the Senni Beds Formation and Brownstones Formation of the Old Red Sandstone laid down during the Devonian period. A north-northwest - south-southeast trending fault runs across its north-eastern face.
This face is much the steepest and has its origins in the ice ages when a minor glacier grew at this spot. It has left a couple of arcuate moraines which are readily seen from the track. The glaciated rock face has been quarried. The quarry is designated as a site of special scientific interest for its geological interest.[2]