Fan Hir
| Fan Hir | |
|---|---|
| Fan Hir summit ridge | |
| Highest point | |
| Elevation | 760 m (2,490 ft) | 
| Prominence | 43 m (141 ft) | 
| Parent peak | Fan Brycheiniog | 
| Listing | Hewitt, Nuttall | 
| Coordinates | 51°52′25″N 3°41′59″W / 51.8736°N 3.6996°W | 
| Naming | |
| English translation | long beacon | 
| Language of name | Welsh | 
| Geography | |
| Location | Powys, Wales | 
| Parent range | Brecon Beacons | 
| OS grid | SN825217 | 
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 a path rises from Llyn y Fan Fawr via a stone staircase.
The hill is drained to east and north by streams which make their way into the River Tawe.