Pen y Gadair Fawr Summit Cairn – Blaen Grwyne Fawr loop from Blaenau-Isaf Farm

Routes

Running trails & routes

Pen y Gadair Fawr Summit Cairn – Blaen Grwyne Fawr loop from Blaenau-Isaf Farm

Hard

runners

Pen y Gadair Fawr Summit Cairn – Blaen Grwyne Fawr loop from Blaenau-Isaf Farm

02:41

20.1km

780m

Running

Hard run. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels. The starting point of the route is right next to a parking lot.

Last updated: August 5, 2026

Tips

Your route passes through a protected area

Please check local regulations for:

Bannau Brycheiniog National Park

Waypoints

Start point

Parking

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2.20 km

Grwyne Fawr Valley Trail

Highlight (Segment) • Trail

A long, languid, occasionally rocky descent along the Grwyne Fawr. It's a great reward for the ride and push up Y Das if you're riding it as a descent. As a climb, it's perfectly possible too.

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5.12 km

Grwyne Fawr Bothy

Highlight • Mountain Hut

Grwyne Fawr bothy is a wonderful place to spend the night. On the banks of the reservoir, and nestled between the hills that give it its name, it's a perfectly …

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6.48 km

Climb to Grwyne Fawr Reservoir

Highlight • Climb

Fantastic climb to the reservoir fairly tough on the gravel bike with rough sections. stunning scenery back down the valley and as you approach the reservoir!! The climb above, to …

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11.5 km

Pen y Gadair Fawr Summit Cairn

Highlight • Viewpoint

In terms of height, Pen y Gadair Fawr plays second fiddle only to Waun Fach as the Black Mountains' second highest summit. However, where Waun Fach's top is broad and …

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13.6 km

Waun Fach summit

Highlight • Summit

A silent giant, Waun Fach is the highest point in South Wales' Black Mountains. Its gradual slopes and the flat nature of its summit mean that it can hardly be …

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13.6 km