Hill data: The Database of British and Irish Hills v18.6 (CC BY 4.0)Height719.6 m2,361 ft
Grid RefSO 20690 24307
OS MapOL13OS Explorer
AreaBlack Mountains
Near the end of the more westerly of Waun Fach's two broad southern ridges, Pen Allt-mawr is the third highest peak in the Black Mountains at 719.6 m. Its stony summit has a trig point, a large shelter cairn and damaged Bronze Age cairns, though the highest ground is about 30 m south of the trig point. Pen Cerrig-calch is its close neighbour to the south, 2.1 km away.
New to the Pennants?Read our guide: What Are The Welsh Pennants?Rock & Ground
A slab of Late Devonian Quartz Conglomerate caps the stony summit, and softer mudstone bands give the hill a stepped look.
Summit Weather
Our Route
Distance6.0 mi9.7 km
Ascent520 m1,710 ft
Time3h 15mwalking
StartSO 2302 2072Grid reference of the start
DirectionsAlso on this route: Pen Cerrig-calch
Safety: Routes are a guide only. Carry a map and compass and know how to use them, check the weather before you go, and turn back if in doubt. You use this route at your own risk.
