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Gwaun Cerrig Llwydion: Plateau and Peak in the Brecon Beacons

Explore the rugged sandstone plateau of Gwaun Cerrig Llwydion, a scenic hiking gem with panoramic views in Wales’ Brecon Beacons.

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Gwaun Cerrig Llwydion is a striking high plateau in the Brecon Beacons National Park, Wales, known for its rugged sandstone landscape and panoramic views. Its summit, often called Bwlch y Ddwyallt, rises to 754 meters and offers hikers a scenic experience with classic valley vistas, geological interest, and access to surrounding peaks. The area is a favored hiking destination for those seeking open country terrain and natural beauty near Merthyr Tydfil.

A brief summary to Gwaun Cerrig Llwydion

  • Merthyr Tydfil, Llanfrynach, GB
  • Duration: 2 to 5 hours
  • Free
  • Environment icon Outdoor
  • Mobile reception: 4 out of 5
  • Monday 12 am-12 am
  • Tuesday 12 am-12 am
  • Wednesday 12 am-12 am
  • Thursday 12 am-12 am
  • Friday 12 am-12 am
  • Saturday 12 am-12 am
  • Sunday 12 am-12 am

Local tips

  • Wear sturdy hiking boots as the terrain includes rocky sandstone and uneven moorland paths.
  • Check weather forecasts before visiting; conditions can change rapidly in upland areas.
  • Use a detailed map or GPS as some trails around the plateau are faint and unmarked.
  • Visit during clear weather for the best panoramic views from Bwlch y Ddwyallt summit.
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Getting There

  • Car

    Driving from Merthyr Tydfil to Gwaun Cerrig Llwydion takes approximately 25 to 35 minutes. Use the A470 followed by the A4059 towards Llanfrynach. Parking is limited near trailheads, so plan accordingly. No parking fees apply.

  • Public Transport

    Take a bus from Merthyr Tydfil town center towards Llanfrynach, with a journey time around 40 to 50 minutes depending on service frequency. From Llanfrynach, access to the plateau requires a moderate hike. Bus services may be less frequent on weekends.

  • Hiking

    Hiking routes to Gwaun Cerrig Llwydion vary in length and difficulty. Approaches from the Beacons Way along the southern edge offer moderate terrain and typically take 2 to 4 hours round trip. Trails can be uneven and exposed, so suitable footwear and weather preparation are essential.

Gwaun Cerrig Llwydion location weather suitability

  • Weather icon Any Weather
  • Weather icon Rain / Wet Weather
  • Weather icon Clear Skies
  • Weather icon Windy Conditions
  • Weather icon Cold Weather
  • Weather icon Mild Temperatures

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Discover more about Gwaun Cerrig Llwydion

Distinctive Plateau and Summit in the Brecon Beacons

Gwaun Cerrig Llwydion is a prominent upland plateau located in the eastern section of the Brecon Beacons National Park in south Wales. The plateau reaches its highest point at Bwlch y Ddwyallt, standing at 754 meters above sea level. This summit is notable for its expansive views overlooking the head of Cwm Cwareli valley. The name Bwlch y Ddwyallt is somewhat unusual as 'bwlch' typically means a mountain pass, yet here it denotes the peak of the plateau. The terrain is characterized by broad, open moorland and steep edges that provide dramatic vistas across the surrounding landscape.

Geological Foundations and Landscape Features

The plateau’s geology is dominated by hard-wearing sandstones from the Devonian period, specifically the Plateau Beds Formation of the Old Red Sandstone. These rock layers lie atop the Brownstones Formation, also Devonian in age, which forms much of the hill’s bulk. Evidence of glaciation during the ice ages is visible in the cliffs below Bwlch y Ddwyallt and nearby Graig Fan Las, adding to the area's geological interest. The rugged sandstone cliffs and moorland create a wild and natural environment that is both visually striking and ecologically significant.

Hiking and Outdoor Experience

Gwaun Cerrig Llwydion is classified as open country, allowing free access for walkers and hikers. It forms part of the extensive Brecon Beacons trail network, with the Beacons Way running along its southern edge. Other footpaths encircle the plateau, connecting it to neighboring peaks such as Fan y Big and Cribyn. The terrain offers a mix of broad ridge walking and steep descents, ideal for hikers seeking both challenge and scenic reward. The plateau’s open nature provides a sense of vastness and tranquility, making it a favored spot for nature lovers and outdoor enthusiasts.

Natural Environment and Wildlife Habitat

The plateau’s upland moorland supports a variety of wildlife typical of the Brecon Beacons, including upland birds and hardy plant species adapted to the exposed conditions. The landscape’s openness and minimal human development contribute to its status as an important habitat within the national park. Visitors can enjoy the peaceful atmosphere and the opportunity to observe nature in a relatively undisturbed setting.

Connection to Local Culture and Geography

Situated near the village of Llanfrynach and the town of Merthyr Tydfil, Gwaun Cerrig Llwydion is part of a culturally rich region of Wales. The area’s Welsh place names reflect its heritage and the longstanding relationship between the land and local communities. The plateau also marks the source area of the River Caerfanell, which flows steeply down from this high ground, adding hydrological significance to the site.

Visitor Information and Accessibility

The area is accessible year-round and offers a natural escape for walkers of varying abilities, though some routes require moderate fitness due to elevation and terrain. There are no formal opening hours as it is open countryside, but visitors should prepare for variable weather conditions typical of upland Wales. Nearby visitor centers in the Brecon Beacons provide additional information and support for exploring the region.

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