Best natural monuments around Ynyshir offer a diverse range of natural features within a rich landscape. The region is characterized by its varied habitats, including woodlands, reedbeds, and saltmarsh, all set against the backdrop of the Dyfi estuary. This area is recognized for its conservation status, holding Ramsar, Natura 2000, and SSSI designations. Visitors can explore 7 beautiful natural monuments that showcase the area's geological and scenic importance.
Last updated: August 11, 2026
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High above the A470 to the north of Quaker’s Yard, the Giant’s Bite is a dramatic gap in the skyline quarried from the ridge top at the former Cefn Glas mine and quarry. ❤️👌 The site was intensively grazed up to the mid-1990s when a large belt of native trees were planted on the lower slopes. These trees are now maturing and have helped to heal the visible mining scares. The shales forming the upper soil horizons support a wide variety of native flowering grassland species including wild strawberry, cowslip, foxglove and wild thyme, and the site is increasingly becoming re-vegetated by scrub species. Incredibly Fine views of the Taff and Cynon valleys are afforded from the summit ridge, while the line of the former Glamorganshire Canal is also discernible.
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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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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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Cefn Eglwysilan is a hill in South Wales, the twin 1,253 feet (382 m) summits of which lie just over one mile (2 km) east of Pontypridd in Rhondda Cynon Taf county borough. Its eastern side lies within the community of Aber Valley in Caerphilly county borough. Like neighbouring Mynydd Eglwysilan, the hill is named after the hamlet of Eglwysilan, the church here being dedicated to an obscure saint Ilan. A wireless transmission station is sited on the more northerly of the two summits (at OS grid ref ST 099911). The southerly one is crowned by a trig point. It is a UK listed Marilyn.
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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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The Rocking Stone or “Y Maen Chwyf” in Welsh is a glacial boulder dating back to the Ice Age. It was a focal point of the “Gathering of Bards” organised by stonemason Edward Williams in 1814.
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The Rocking Stone in Pontypridd is set within the middle of a fake Druidic stone circle, it's not prehistoric.
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The region, particularly the renowned RSPB Ynys-Hir Nature Reserve, is a haven for diverse wildlife. Birdwatchers can spot pied flycatchers, redstarts, wood warblers, and various woodpeckers in spring and summer. Winter brings ducks, geese, and wildfowl. Birds of prey like red kites and peregrines are present year-round. Beyond birds, the reserve supports special butterflies in summer and a rich variety of wildflowers like wood anemones and cowslips.
Yes, The Rocking Stone and the Gorsedd Circle is a notable site. The Rocking Stone, or “Y Maen Chwyf,” is a glacial boulder from the Ice Age that served as a focal point for Bardic gatherings, including one organized in 1814. The Gorsedd Circle of smaller stones was constructed around it in 1849. Additionally, parts of the woodlands within the RSPB Ynys-Hir Nature Reserve were historically used for charcoal production related to lead and smelting industries.
For breathtaking vistas, consider visiting Tarren y Bwllfa, which offers stunning views of the Brecon Beacons and the former industrial landscape. Giant's Bite provides fine views of the Taff and Cynon valleys. You can also find panoramic views from the trig points at Cefn Eglwysilan Trig Point and Twyn Brynbychan Trig Point, both offering expansive perspectives of the surrounding valleys.
The RSPB Ynys-Hir Nature Reserve is very family-friendly, offering a visitor center with a shop, exhibitions, and activities like a brass rubbing trail. Binoculars, pond dipping kits, and grass sweeping kits are available for hire. The Rocking Stone and the Gorsedd Circle is also a fascinating spot for families, with its unique glacial boulder and historical context.
The area around Ynyshir offers a variety of outdoor activities. You can explore numerous hiking trails, with options ranging from easy to difficult, such as the 'Clydach Lakes loop' or the longer 'Carn Fawr Bronze Age Monument loop'. For cyclists, there are extensive road cycling routes like the 'Rhigos Climb Viewpoint' route, and challenging gravel biking trails, including the 'Rhigos Mountain Fire Roads'. You can find more details on these activities in the hiking guide, road cycling guide, and gravel biking guide for Ynyshir.
The best time to visit depends on your interests. Spring and summer are ideal for birdwatching at the RSPB Ynys-Hir Nature Reserve, with breeding birds and wildflowers in bloom. The oak woodlands are particularly stunning during these seasons. Winter offers opportunities to see ducks, geese, and various wildfowl. The scenic viewpoints like Tarren y Bwllfa can be enjoyed year-round, though clear weather will enhance the views.
Yes, the RSPB Ynys-Hir Nature Reserve features over three miles of well-maintained trails and five to seven viewing hides. These trails allow visitors to explore diverse habitats like oak woodlands, reedbeds, and saltmarsh, offering excellent opportunities for wildlife observation without disturbance. The trails are suitable for delightful walks even when bird activity is less pronounced.
The region boasts several interesting geological formations. Tarren y Bwllfa is one of Britain's most southerly glacial cwms, offering a dramatic landscape shaped by ice. Giant's Bite is a dramatic gap in the skyline, quarried from a ridge top, showcasing the impact of both natural forces and human activity. Additionally, The Rocking Stone is a large glacial boulder, a remnant from the Ice Age.
The natural monuments around Ynyshir are characterized by a rich variety of habitats. The RSPB Ynys-Hir Nature Reserve, for instance, encompasses a mosaic of oak woodlands (some dating back to the 17th century), reedbeds, freshwater pools, and saltmarsh, all set against the backdrop of the Dyfi estuary. These diverse environments support a wide array of plant and animal life.
Yes, the area features several prominent trig points and summits. Cefn Eglwysilan Trig Point marks the southerly summit of Cefn Eglwysilan, a UK listed Marilyn. Another notable point is Twyn Brynbychan Trig Point, which offers views above the Cynnon valleys and is near a Bronze Age site.
The RSPB Ynys-Hir Nature Reserve holds significant conservation status, being located within the UNESCO Dyfi Biosphere and awarded Ramsar, Natura 2000, and Site of Scientific Interest (SSSI) designations. This highlights its international importance for protecting diverse habitats and supporting over 60 breeding bird species through effective habitat management.


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