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.

Its Welsh name means "long peak", a fitting description, particularly if seen from the east when its steep eastern face is seen to advantage.

The monuments are close to the road further on, but cannot be seen directly from there, so the visitor must cross the River Tawe and climb the bank to view the site.

There are many other ancient remains extant on the moor, such as hut circles and house platform as well as traces of cultivation such as lynchets.

The Beacons Way long distance footpath runs beneath Fan Hir on the east affording close-up views of this impressive hill.