Best natural monuments around Cwm Clydach are found within a steep-sided valley carved by the River Clydach, featuring diverse geological and ecological characteristics. This area, situated within the Brecon Beacons National Park, is recognized for its unique attributes as a National Nature Reserve and a Site of Special Scientific Interest. The gorge showcases exposed rock formations, ancient woodlands, and various natural features, making it a notable destination for outdoor exploration. Visitors can experience a range of natural landmarks, from impressive…
Last updated: July 1, 2026
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Resembling something which should be found in Iceland, Pen Pych waterfall is a series of cascades which tumble over a sheer sided sedimentary rock face. The base of waterfall is enveloped by a half amphitheatre cliffs which only adds to the waterfalls impressive appearance. Theres is no plunge pool at the base of the falls, instead the tallest section spills 21m onto number of boulders which have tumbled from the cliffs above in years gone by. The path will lead you to a large rocky viewing area to the right hand side of the falls beneath the cliffs. You can climb up to the base of the falls, if you do do that take care as the rocks can be very slippery. (https://ohwhataknight.co.uk/blog/pen-pych-mountain-and-waterfall-hike-guide)
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Beautiful waterfall with free parking easy trail up not to hard
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Wow! Tarren y Bwllfa looms large over the valley below. It is one of Britain's most Southerly glacial cwms. Stunning views of the Brecon Beacons and the former industrial landscape nearby.
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A beautiful waterfall often overlooked by the masses as they head for more famous waterfalls in the Brecon Beacons. But you know better! Be aware that in places the footpath is narrow, uneven and very steep. You will need to take extra care in the wet / after prolonged rain.
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We walked miles. Up to the waterfall on Gillies trail, followed the path up onto the rocky and then to the trig point on Twyn Brynbychan, above the cynnon valleys. Enjoyed a breather on top, before trekking around the back forestry where you can see Aberfan and Merthyr Vale and headed over to the bronze age sight before descending down to Cwmaman and back to the car.
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A few steps off the main path, leads to a downward, wooden stepped, clamber (with care as steps are often slippery) to a beautiful hidden gem ...
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The Rocking Stone or "Y Maen Chwyf" in Welsh is a glacial boulder remaining from the Ice Age. It formed the central point for a "Gorsedd" or "Gathering of Bards" in 1814, which was organised by stonemason, Edward Williams, known as "Iolo Morganwg". The Gorsedd Circle of smaller stones was constructed in 1849 by Evan Davies, Bardic name "Myfyr Morganwg" and has often been used for Bardic gatherings, and as a focal point for other public occasions.
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The Rocking Stone ('Y Maen Chwyf' in Welsh) is a glacial boulder left over from when ice sheets covered these lands. The stone circle that surrounds the stone was constructed in 1849 by Evan Davies. The site has often been used for Bardic gatherings and public events.
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Cwm Clydach is home to several remarkable natural monuments. You can explore the impressive Pen-Pych Waterfall, a series of cascades tumbling over a sheer rock face. For expansive views of the Brecon Beacons, visit Tarren y Bwllfa, one of Britain's most southerly glacial cwms. Don't miss the unique The Rocking Stone and the Gorsedd Circle, a glacial boulder with historical significance.
Yes, Cwm Clydach features the historically significant The Rocking Stone and the Gorsedd Circle. The Rocking Stone, or 'Y Maen Chwyf', is a glacial boulder from the Ice Age, and the surrounding stone circle was constructed in 1849, often used for Bardic gatherings. The gorge also holds remnants of its industrial past, adding a layer of historical context to the natural landscape.
Cwm Clydach is rich in unique natural features. The gorge itself is a steep-sided valley carved by the River Clydach, showcasing exposed rock formations and glacial till. You'll find ancient semi-natural beech woodlands, some of the most westerly native beech trees in the UK. The area also boasts tufa formations, associated with the moss Palustriella, and the phreatic cave system of Ogof Clogwyn.
Cwm Clydach is a haven for biodiversity. The extensive woodlands support rare plants like the bird's-nest orchid and specialist fungi. Birdwatchers can spot nuthatches, woodpeckers, sparrowhawks, kestrels, tawny owls, grey wagtails, and dippers along the river, with red kites and ravens soaring overhead. It's an excellent location for wildlife observation, particularly in autumn for diverse fungal assemblages.
Cwm Clydach offers different visual delights throughout the year. The changing seasons bring vibrant spring growth, lush summer greenery, and the myriad colors of autumn foliage. Waterfalls, such as Pen-Pych Waterfall, are particularly impressive after rainfall. Any time of year provides opportunities for exploration, but autumn is especially good for fungi and vibrant colors.
Yes, Cwm Clydach offers options suitable for families. The Rocking Stone and the Gorsedd Circle is categorized as family-friendly. The area features waymarked footpaths and picnic sites, providing peaceful woodland walks alongside the river that can be enjoyed by families. The diverse natural features also offer educational opportunities for children.
Cwm Clydach offers numerous opportunities for walking and hiking. You'll find waymarked footpaths that invite exploration, providing peaceful woodland walks alongside the river. The terrain can vary, with some paths being narrow, uneven, and steep, especially near waterfalls like Pen-Pych Waterfall. For more detailed route options, you can explore the various walking guides available for the region.
Yes, the area around Cwm Clydach provides excellent opportunities for cycling and mountain biking. There are various routes available, ranging in difficulty. For gravel biking, you can find routes like the 'Descent Into Ogmore Vale – Winding Path and Archway loop'. Mountain biking enthusiasts can explore trails such as the 'Cwm Clydach Countryside Park – Top Lake, Clydach Vale loop'. For more options, check out the Gravel biking around Cwm Clydach, MTB Trails around Cwm Clydach, and Cycling around Cwm Clydach guides.
For stunning panoramic views, head to Tarren y Bwllfa, which offers expansive vistas of the Brecon Beacons and the surrounding landscape. Another excellent spot for views is the Twyn Brynbychan Trig Point, which provides a great vantage point over the Cynon valleys.
Absolutely. The most prominent is Pen-Pych Waterfall, a series of cascades with its tallest section spilling 21m onto boulders below. The gorge itself is known for several attractive waterfalls, particularly impressive after rainfall, adding to the scenic beauty of the area. You might also discover other smaller, hidden waterfalls like Waterfall, just a few steps off the main path.
Cwm Clydach is highly significant due to its diverse geological and ecological features. It's designated as a National Nature Reserve, a Site of Special Scientific Interest (SSSI), and a Special Area of Conservation (SAC). Its importance stems from its unique U-shaped glacial valley, ancient beech woodlands, rare flora and fauna, and significant geological rock exposures, making it a crucial site for conservation and study.


Extend your search for the best caves by checking out these guides of the top ones around Cwm Clydach: