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Pen Trumau – Ridge to Waun Fach loop from The Vale of Grwyney

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Hiking trails & Routes

Pen Trumau – Ridge to Waun Fach loop from The Vale of Grwyney

Hard

4.3

(3)

hikers

Pen Trumau – Ridge to Waun Fach loop from The Vale of Grwyney

05:59

19.3km

700m

Hiking

Hard hike. Very good fitness required. Easily-accessible paths. Suitable for all skill levels.

Last updated: May 15, 2026

Tips

Your route passes through a protected area

Please check local regulations for:

Bannau Brycheiniog National Park

Waypoints

Start point

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3.97 km

Mary's Stones (Macnamara Boundary Stones)

Highlight • Historical Site

The story of the Macnamara boundary stones near the summit of Pen Twyn Glass mountain is a long but interesting one. Further details can be found here: ewyaslacy.org.uk/-/Mary-s-Stones-investigating-the-Mrs-Macnamara-Boundary-Stones-in-the-Black-Mountains/1820s/nw_lty_1002

Tip by

6.35 km

Mynydd Llysiau

Highlight • Viewpoint

Mynydd Llysiau is a subsidiary summit of Waun Fach in the Black Mountains in south-eastern Wales. It lies halfway between Waun Fach and Pen Allt-mawr. It is a distinguished summit with a steep eastern face. The summit, marked by a pile of stones, is long grassy ridge. It is a UK listed Nuttall.

Tip by

7.54 km

Pen Trumau

Highlight • Summit

This is a Beautilful view

Tip by

7.68 km

Ridge to Waun Fach

Highlight • Trail

If you do the Waun Fach Loop you can take in Pen Cerrig Calch and six other Nuttalls and it is a glorious 25km high level route with nearly 1,000m of height gain. For route details click here: komoot.com/tour/280372758

Tip by

9.25 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 called a peak. It's nevertheless an attractive objective due to its great height and sense of remoteness. Three ridges converge on its summit, making it one of the true hubs of the range.

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9.26 km

Waun Fach Ordnance Survey Marker

Highlight • Monument

11.4 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 relatively uninspiring, Pen y Gadair Fawr's is a little more like a peak in character. The summit is at a junction of paths: head east for Chwarel y Fan and the Mynydd Du Forest, venture south to Pen Twyn Mawr, or stride northeast to Waun Fach.

Tip by

13.8 km

Pen Twyn Mawr

Highlight • Viewpoint

Pen Twyn Mawr is a top of Pen y Gadair Fawr in the Black Mountains in south-eastern Wales. It lies on one of the many south ridges of Waun Fach. The summit is marked by a pile of stones in an area of sandy soil and heather. Pen y Gadair Fawr is to the north, Chwarel y Fan to the east and Pen Allt-mawr to the west. It is a UK listed Nuttall.

Tip by

19.3 km

End point

Way Types & Surfaces

Way Types

12.5 km

4.37 km

2.44 km

Surfaces

8.76 km

6.72 km

1.43 km

1.24 km

1.20 km

Elevation

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

Highest point (800 m)

Lowest point (230 m)

Weather

Friday 31 July

21°C

8°C

0 %

Additional weather tips

Max wind speed: 13.0 km/h

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Pen Trumau – Ridge to Waun Fach loop from The Vale of Grwyney

Mary's Stones (Macnamara Boundary Stones)

Mynydd Llysiau

Pen Trumau

Ridge to Waun Fach

Waun Fach summit

Waun Fach Ordnance Survey Marker

Pen y Gadair Fawr Summit Cairn

Pen Twyn Mawr

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