Gwaun Cerrig Llwydion (Bwlch y Ddwyallt)
754m (2475ft)
The Brecon Beacons Area, The Brecon Beacons, Powys, Wales
Gwaun Cerrig Llwydion (Bwlch y Ddwyallt) means 'Gray Stone Heath (Pass with Two Hills)' in Welsh and is pronounced 'g-wine kerrig thlu-dion (bulch uh thui-athlt)'.
The summit of Gwaun Cerrig Llwydion (Bwlch y Ddwyallt) is marked by a large flat cairn.
You can find Gwaun Cerrig Llwydion (Bwlch y Ddwyallt) & all the walks that climb it on these unique free-to-access Interactive Walk Planning Maps: (click/TAP to select)
1:25,000 scale OS Explorer Map (the ones with orange/yellow covers):
1:50,000 scale OS Landranger Map (the ones with pink/magenta covers):
See Gwaun Cerrig Llwydion (Bwlch y Ddwyallt) and the surrounding tops on our free-to-access 'Google Style' Peak Bagging Maps:
See Gwaun Cerrig Llwydion (Bwlch y Ddwyallt) and the surrounding tops on our downloadable PDF Peak Bagging Map:
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Vital Statistics:
| Length: | 7.75ml (12.5km) |
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| Ascent: | 2,445ft (745m) |
| Time: | 5.25hrs |
| Grade: |  (Moderate) |
Route Summary:
Talybont Reservoir - Allt Lwyd - Gwalciau'r Cwm - Nant Cynafon - Cwar y Gigfran - Gwaun Cerrig Llwydion (Bwlch y Ddwyallt) - Waun Rydd - Craig Pwllfa - Carn Pica - Twyn Du (Waun Rydd) - Berth Lwyd Fach - Nant Tarthwynni - Talybont Reservoir
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Vital Statistics:
| Length: | 8.25ml (13km) |
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| Ascent: | 1,942ft (592m) |
| Time: | 5 hrs |
| Grade: | (Moderate) |
Route Summary:
Blaen y Glyn - Craig y Fan Ddu - Gwaun Cerrig Llwydion (Bwlch y Ddwyallt) - Craig Cwareli - Craig Cwmoergwm - Fan y Big - Bwlch ar y Fan - Roman Road - The Taff Trail - Blaen y Glyn
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Vital Statistics:
| Length: | 9ml (14.5km) |
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| Ascent: | 2,330ft (710m) |
| Time: | 5½ hrs |
| Grade: | (Moderate) |
Route Summary:
Talybont Reservoir - Twyn Du (Waun Rydd) - Carn Pica - Craig Pwllfa - Waun Rydd - Gwaun Cerrig Llwydion (Bwlch y Ddwyallt) - Rhiw Bwlch y Ddwyallt - Gist Wen - Ffordd Las or Bwlch Main - Bryn (Waun Rydd) - Bryn Bair - The Usk Valley Walk - Aber Village - Talybont Reservoir
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Vital Statistics:
| Length: | 10ml (16km) |
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| Ascent: | 2,521ft (768m) |
| Time: | 6.25hrs |
| Grade: | (Moderate) |
Route Summary:
Talybont Reservoir - Allt Lwyd - Gwalciau'r Cwm - Carn Pica - Craig Pwllfa - Waun Rydd - Gwaun Cerrig Llwydion (Bwlch y Ddwyallt) - Rhiw Bwlch y Ddwyallt - Gist Wen - Ffordd Las or Bwlch Main - Bryn (Waun Rydd) - Bryn Bair - The Usk Valley Walk - Aber Village - Talybont Reservoir
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Vital Statistics:
| Length: | 13.25ml (21km) |
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| Ascent: | 3,397ft (1,035m) |
| Time: | 8.25hrs |
| Grade: |  (Hard) |
Route Summary:
Talybont Reservoir - Allt Lwyd - Gwalciau'r Cwm - Carn Pica - Craig Pwllfa - Waun Rydd - Gwaun Cerrig Llwydion (Bwlch y Ddwyallt) - Graig Fan Las - Craig y Fan Ddu - Blaen y Glyn - The Taff Trail - Pant y Creigiau - Cefn Tarenni Cochion - Bryniau Gleision (Talybont Reservoir) - Darren Fawr - Darren Fach - Pen Bwlch Glasgwm - Pen Rhiw-calch - The Taff Trail - Talybont Reservoir
Fellow go4awalkers who have already walked, climbed, summited & bagged Gwaun Cerrig Llwydion (Bwlch y Ddwyallt)
Nikola Jenkins walked up Gwaun Cerrig Llwydion (Bwlch y Ddwyallt) on May 3rd, 2025 [from/via/route] Aber village [with] April Bryant and Charlotte [weather] Hot, still lower down but windy at the ridge - got sunburnt
Mark Davidson climbed Gwaun Cerrig Llwydion (Bwlch y Ddwyallt) on July 10th, 2009 [from/via/route] Walk po152 Allt Lwyd, Waun Rydd & Bryn from Talybont Reservoir [with] MK (Well for some of it!) [weather] Quite nice
Sion Britton bagged Gwaun Cerrig Llwydion (Bwlch y Ddwyallt) on December 12th, 2020 [from/via/route] Fan y Big o Blaen y Glyn Uchaf. [with] Rhiannon [weather] Showers & Cool.
Kimberley Gratton hiked Gwaun Cerrig Llwydion (Bwlch y Ddwyallt) on July 23rd, 2019 [from/via/route] I started off from Talybont Reservoir, going up NW on a signed track all the way to Allt Lwyd (this was VERY steep!) From there I went via the Cam Pica stone built beacon towards Waun Rydd, & then Gwaun Cerrig Lwydion. Finally heading to Bryn (Waun Rydd) & down back to Talybont Reservoir. [weather] Hot & Sunny - The path from Bryn back to Talybont Reservoir wasn't clear & not as pleasant as the rest of the walk. I would suggest going back the way you came.
Mary Norris has summited Gwaun Cerrig Llwydion (Bwlch y Ddwyallt) [from/via/route] Walk po131, start point Blaen y Glyn carpark [with] Sue Davies and Betsie! [weather] Warm, dry & sunny, cool & windy in parts - Fab walk, best bit was the Diving Board on Fan y Big. Tough climb to start.
Christina Lander conquered Gwaun Cerrig Llwydion (Bwlch y Ddwyallt) on March 26th, 2014 [from/via/route] Upper Neuadd Reservoir - Craig Fan Ddu - Corn Du - Pen y Fan - Cribyn - Fan y Big - Upper Neuadd Reservoir [with] Dick & Suzanne [weather] Overcast but dry
David Price scaled Gwaun Cerrig Llwydion (Bwlch y Ddwyallt) on September 29th, 2012 [from/via/route] Pencelli [with] Jean [weather] Fine
Robert Taylor-Marriott walked up Gwaun Cerrig Llwydion (Bwlch y Ddwyallt) on December 5th, 2012 [from/via/route] Route 46: Bwlch y Ddwyallt, Waun Rydd & Allt Lwyd (BWA). [with] Vince Wetton and Robert Taylor-Marriott [weather] Sunny, snow & cold
Tim Buckley climbed Gwaun Cerrig Llwydion (Bwlch y Ddwyallt) on November 23rd, 2013 [from/via/route] From the Blaen Y Glyn car park, via Craig Fan Ddu, WW2 bomber crash site, Carn Pica, Waun Rydd then Bwlch y Ddwyallt onto Fan Y Big then back to the CP [with] Solo Walk [weather] Freezing, bitter wind on prevailing paths, clear blue skies to the south & hill fog to the north. When clear it was a beautiful day. - The highlight was the WW2 Wellington bomber crash sight & memorial. I've been walking up here for years & never visited this site - well worth the effort, the memorial is well maintained & poppy wreathes tied to it. Amazingly there is considerable wreckage to be seen, nice to see that in 60 years souvenere hunters haven't stripped the site clear.
Vince Wetton bagged Gwaun Cerrig Llwydion (Bwlch y Ddwyallt) on December 5th, 2012 [with] RTM
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