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

Hiking trails & Routes

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

Moderate

4.9

(9)

189

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 walkable paths.

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

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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 …

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5.78 km

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.

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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 …

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13.2 km

End point

Way Types & Surfaces

Way Types

6.56 km

5.24 km

1.37 km

< 100 m

Surfaces

11.8 km

1.27 km

< 100 m

Elevation

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

Weather

Today

Tuesday 10 November

6°C

3°C

95 %

Additional weather tips

It’s set to rain on your activity. Pack a waterproof jacket.

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Comments

September 21, 2025,Pen Allt-mawr – Pen Cerrig-calch Summit loop from Cwmdu

Beautiful views east to Skirrid and Sugar Loaf, north to Hay Bluff and Talgarth, and west to Talybont. We did this on a sunny September day with a brisk northerly breeze, which made the anticlockwise direction the right one to take: wind on your back on the higher section.