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Pen y Gadair Fawr Summit Cairn – Grwyne Fawr Bothy loop from Blaen y Cwm

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Running trails & routes

Pen y Gadair Fawr Summit Cairn – Grwyne Fawr Bothy loop from Blaen y Cwm

Hard

runners

Pen y Gadair Fawr Summit Cairn – Grwyne Fawr Bothy loop from Blaen y Cwm

01:55

15.1km

460m

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: May 16, 2026

Tips

Your route passes through a protected area

Please check local regulations for:

Bannau Brycheiniog National Park

Waypoints

Start point

Parking

Get Directions

3.01 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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3.04 km

Cairn With Panoramic View

Highlight • Natural Monument

I've labelled this as 'gravel' but with caution. it's essentially a hiking route but you can push your bike up here. as we did. there's short stretches you can ride though. just expect plenty of hike a bike.

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5.11 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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5.12 km

Waun Fach Ordnance Survey Marker

Highlight • Monument

8.25 km

Scenic Rest Spot with Hill View

Highlight • Viewpoint

Great spot for a lunch break mid ride. Was a little open when windy though

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8.31 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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11.2 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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12.6 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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15.1 km

End point

Parking

Way Types & Surfaces

Way Types

5.77 km

4.33 km

3.02 km

1.82 km

134 m

< 100 m

Surfaces

5.60 km

4.51 km

2.72 km

2.23 km

< 100 m

Elevation

Nothing selected – click and drag below to see the stats for a specific part of the route.

Weather

Saturday 18 July

24°C

9°C

0 %

Additional weather tips

Max wind speed: 18.0 km/h

to get more detailed weather forecasts along your route

Comments

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Pen y Gadair Fawr Summit Cairn – Grwyne Fawr Bothy loop from Blaen y Cwm

Pen y Gadair Fawr Summit Cairn

Cairn With Panoramic View

Waun Fach summit

Waun Fach Ordnance Survey Marker

Scenic Rest Spot with Hill View

Grwyne Fawr Valley Trail

Grwyne Fawr Bothy

Climb to Grwyne Fawr Reservoir

Nearby routes

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