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Pen Allt-mawr – Pen Cerrig-calch summit loop from The Vale of Grwyney

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Pen Allt-mawr – Pen Cerrig-calch summit loop from The Vale of Grwyney

Moderate

5.0

(8)

174

hikers

Pen Allt-mawr – Pen Cerrig-calch summit loop from The Vale of Grwyney

04:10

13.2km

540m

Hiking

Moderate hike. Good fitness required. Easily-accessible paths. Suitable for all skill levels.

Last updated: April 22, 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

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4.01 km

Pen Twyn Glas

Highlight • Viewpoint

Pen Twyn Glas is a smaller subsidiary peak on the ridge up to Waun Fach. It's 646m and doesn't have a trig point. Great views from the summit tough both west towards Pen y Fan and up and down the ridge. It's part of the excellent Waun Fach horseshoe and visited on the Black Mountains round.

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5.78 km

Pen Allt-mawr

Highlight • Viewpoint

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

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8.18 km

Pen Cerrig-calch summit

Highlight • Viewpoint

This remote and little visited summit is perfect for explorers keen to escape the crowds. Standing at 2,300 feet (701 m), the summit boasts spectacular views over the River Usk valley, Crickhowell, and further afield.

Tip by

9.39 km

View of Sugar Loaf and Table Mountain

Highlight • Natural Monument

10.4 km

Crug Hywel (Table Mountain) — summit and Iron Age hillfort

Highlight • Summit

The flat and slightly sloping summit of Table Mountain looms over Crickhowell. At 1,480 feet (451 m) high, its flat top — at a slightly tipsy-looking angle — is an iconic Brecon Beacons feature. The views are sensational too. Gazing westwards you have the lovely Usk valley rising into the central Brecon Beacons and the industrial valleys of South Wales, while the brooding Black Mountains look over your shoulder.

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13.2 km

End point

Way Types & Surfaces

Way Types

6.54 km

5.24 km

1.40 km

< 100 m

Surfaces

11.7 km

1.24 km

161 m

< 100 m

Elevation

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

Weather

Wednesday 27 May

26°C

12°C

0 %

Additional weather tips

Max wind speed: 19.0 km/h

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Our route recommendations are based on thousands of hikes, rides, and runs completed by other people on komoot.

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Pen Allt-mawr – Pen Cerrig-calch summit loop from The Vale of Grwyney

Mary's Stones (Macnamara Boundary Stones)

Pen Twyn Glas

Pen Allt-mawr

Pen Cerrig-calch summit

View of Sugar Loaf and Table Mountain

Crug Hywel (Table Mountain) — summit and Iron Age hillfort

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