Pen y Manllwyn Summit – Pen y Gadair Fawr Summit Cairn loop from Blaen y Cwm

Routes

Hiking trails & Routes

South Wales

Monmouthshire

Crucorney

Pen y Manllwyn Summit – Pen y Gadair Fawr Summit Cairn loop from Blaen y Cwm

Moderate

4.8

(17)

221

hikers

Pen y Manllwyn Summit – Pen y Gadair Fawr Summit Cairn loop from Blaen y Cwm

04:30

15.1km

460m

Hiking

Moderate hike. Good fitness required. Easily walkable paths. The starting point of the route is right next to a parking lot.

Last updated: November 5, 2026

Tips

Your route passes through a protected area

Please check local regulations for:

Bannau Brycheiniog National Park

Waypoints

Start point

Parking

Get Directions

11 m

Forest Path

Highlight • Trail

The terrain up through this beautiful forest can vary in intensity as in unable to see, find and to even trodden along on- depending on the recent weather conditions can …

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39 m

Mynydd Du Forest Car Park

Highlight • Parking

Good/Last starting point in the valley of the Grwyne Fawr

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2.52 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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3.88 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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8.37 km

Pen y Manllwyn (775 m)

Highlight • Summit

9.00 km

Pen y Manllwyn Summit

Highlight • Natural Monument

Pen y Manllwyn 773.71m (2538ft)
Jones and sub Marsh summit

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9.96 km

Waun Fach Ordnance Survey Marker

Highlight • Monument

12.1 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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