Pen Twyn Mawr
658m (2160ft)
The Black Mountains, The Brecon Beacons, Powys, Wales
Not familiar with this top?
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Vital Statistics:
| Length: | 12ml (19km) |
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| Ascent: | 2,637ft (804m) |
| Time: | 7 hrs |
| Grade: |  (Hard) |
Route Summary:
Nuadd-fawr - Llanbedr - Darren Fach - Pen Twyn Glas - Mynydd Llysiau - Pen Trumau - Waun Fach - Pen y Gadair Fawr - Pen Twyn Mawr - Pen Gwyllt Meirch - Nantyrychain - Cwm Farm - Nuadd-fawr
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Vital Statistics:
| Length: | 13.5ml (21.5km) |
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| Ascent: | 3,175ft (968m) |
| Time: | 8 hrs |
| Grade: |  (Hard) |
Route Summary:
Nuadd-fawr - Llanbedr - Table Mountain (Pen Cerrig-calch) - Trwyn Ysgwrfa - Pen Cerrig-calch - Pen Allt-mawr - Pen Twyn Glas - Mynydd Llysiau - Pen Trumau - Waun Fach - Pen y Gadair Fawr - Pen Twyn Mawr - Pen Gwyllt Meirch - Nantyrychain - Cwm Farm - Nuadd-fawr
See Pen Twyn Mawr and the surrounding tops on our free-to-access 'Google Style' Peak Bagging Maps:
See Pen Twyn Mawr and the surrounding tops on our downloadable Peak Bagging Map in PDF format:
NB: Whether you print off a copy or download it to your phone, this PDF Peak Baggers' Map might prove incredibly useful when your are up there on the tops and you cannot get a phone signal.
You can find Pen Twyn Mawr & all the walks that climb it on these unique free-to-access Interactive Walk Planning Maps:
1:25,000 scale OS Explorer Map (orange/yellow covers):
1:50,000 scale OS Landranger Map (pink/magenta covers):
Fellow go4awalkers who have already walked, climbed, summited & bagged Pen Twyn Mawr
Paul Roddam walked up on October 13th, 2025 [with] solo [weather] misty but amazing cloud inversion in the morning after camping
Craig Barrell climbed it on September 27th, 2025 [with] solo [weather] sunny
Jonathan Morris bagged it on July 2nd, 2025 [from/via/route] Llanbear
Melfyn Parry hiked it on July 16th, 2024 [from/via/route] Followed go4awalk route PO153 - Pen Cerrig Calch & Waun Fach from Neuadd Fawr. Once on the ridge the walk is relatively easy, good paths. There are some areas that are quite boggy, so be prepared if following this route after lots of rain. The first peak was hard going, lots of tall bracken & bilberry bushes to fight your way through, I was so glad to reach the top of Pen Cerrig Calch. The final path from the cairn to the minor road leading back to the car park was also overgrown with bracken & the public footpath part was seriously neglected from a maintenance perspective, although the stiles looked almost new the path itself was overgrown with nettle, bramble & even more bracken making the last leg of the walk hard work. [with] On my own [weather] Sunny spells & generally dry. For a mid July walk it was quite cool at times. - Best to avoid this walk when the bracken is in season. If you have to walk in the summer months & especially after rain, waterproofs are a must as the grasses & bracken don't dry out at their base & you can get seriously wet even though you think it's a dry day.
Mark Davidson summited on April 10th, 2005 [from/via/route] Walk po153 Pen Cerrig-calch & Waun Fach from Nuadd-fawr [with] Theresa [weather] Dry but rather cloudy - tops were clear though
Sion Britton conquered it on April 11th, 2021 [from/via/route] O Llanbedr. Horseshoe Route. [with] Solo [weather] Braf/ Cymylog
Simon Burgess scaled on August 23rd, 2020 [from/via/route] Pen Twyn Glas Pen Trumau Waun Fach Pen Y Gadair Fawr Pen Twyn Mawr [with] Solo [weather] Overnight
Dale Tyler walked up on August 30th, 2017 [from/via/route] 7th peak on the Waun Fach horseshoe from Cwmdu to Crickhowell [weather] Mostly glorious, two short sharp showers at the beginning of the walk-enough convince me to reproof my jacket! - 19 mile walk followed by a well deserved pint & meal in Crickhowell. Sticky toffee pudding, mmmmm!
Robert Shaw climbed it on May 13th, 2017 [from/via/route] From Llanthony whilst doing the Black Mountain Challenge. [with] Alcester Gents Sports Club [weather] Wet & misty
Christina Lander bagged it on March 10th, 2015 [from/via/route] Pen Carrig-calch - Pen Allt-mawr - Pen Twyn Glas - Mynydd Llysiau - Pen Trumau - Waun Fach - Pen y Gadair Fawr - Pen Twyn Mawr [with] Dick [weather] Warm & sunny
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More Photographs & Pictures of views from, on or of Pen Twyn Mawr
*270° Panorama featuring Pengenfford, Pen Trumau, Waun Fach, Pen y Gadair Fawr, Pen Twyn Mawr, Crug Mawr and the The Grwyne Fechan valley from Mynydd Llysiau
Send us your photographs and pictures on, of, or from Pen Twyn Mawr
If you would like to add your walk photographs and pictures featuring views from, on or of Pen Twyn Mawr to this page, please send them as email attachments (configured for any computer) along with your name to:
and we shall do our best to publish them.
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