Best natural monuments around Crosskeys are characterized by a landscape featuring hills and elevated viewpoints. The region offers natural formations that include summits and historical sites. These areas provide opportunities for exploring the local geography and its natural features. The terrain is defined by its rolling plateaus and prominent hills.
Last updated: May 3, 2026
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Nice ascent from Crosskeys, but watch out for very overgrown pathways on the Machen side. Great views from the top!
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Twmbarlwm is a prominent hill and archaeological site located near the town of Cwmcarn in South Wales. It is part of the Caerphilly County Borough and is known for both its natural beauty and historical significance. Here are some key points about Twmbarlwm: Key Features: Hillfort: Twmbarlwm is home to the remains of an ancient hillfort, dating back to the Iron Age. The fortifications, which include earthworks and ramparts, suggest it was a significant settlement during that period. Celtic Connections: The name "Twmbarlwm" is thought to derive from Welsh, with "Twm" being a diminutive of "Tudur" and "barlwm" referring to a mound or hill. The site is associated with Celtic history and mythology. Natural Beauty: The hill offers stunning views of the surrounding landscape, including the nearby valleys and mountains. It is a popular destination for walkers, hikers, and outdoor enthusiasts. Archaeological Significance: Twmbarlwm has been the subject of various archaeological studies, which have revealed insights into ancient settlement patterns, defensive strategies, and daily life in prehistoric Wales. Access: The hill is accessible via footpaths, making it a popular spot for local residents and visitors. There are several trails that lead to the summit, offering a rewarding hike. Cultural Heritage: The site is connected to local folklore and legends, contributing to its cultural significance in the region. Visiting: If you plan to visit Twmbarlwm, it’s a good idea to check local resources or hiking guides for specific trails and information about the area. The site is a great way to experience the natural beauty and historical richness of South Wales.
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A small summit above Risca. Known locally as the "Twmp" (the hump), the pimple or the nipple, due to the shape of the mound on the summit.
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Wern Ddu is an SSSI, the quarry workings being around 150 years old and leaving exposed geology that is a little bit older (estimated 300 million years previous).
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Cracking local walk, gain height for amazing views and walk over to twmbarlwm
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plenty of free parking in Machen next to the village hall and library
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Twmbarlwm is a 1,375 foot (419 m) hill that is rich in beauty, history and folklore. From the summit, you are afforded wonderful views of the Severn Estuary. There is an Iron Age hill fort on the summit, too.
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The most popular natural monument is Twmbarlwm Hill and Iron Age hillfort, known for its rich history, folklore, and panoramic views of the Severn Estuary. Another highly regarded spot is Mynydd Machen Summit, offering extensive views over Newport, Cardiff, and the Severn Estuary.
Yes, Llanfrechfa Grange Park Tree is categorized as family-friendly. While the site has a historical past, the park area provides a pleasant natural monument suitable for families.
Many natural monuments around Crosskeys offer spectacular views. From Twmbarlwm Hill, you can see the Severn Estuary. Mynydd Machen Summit provides glorious views over Newport, Cardiff, and the Severn Estuary. Trig point at Mynydd Twyn-glas summit also offers amazing views from its sprawling plateau.
Absolutely. Twmbarlwm Hill features an Iron Age hillfort at its summit, making it a significant historical site. Additionally, Wern Ddu Clay Pit Nature Reserve is an SSSI (Site of Special Scientific Interest) with quarry workings around 150 years old, exposing geology estimated to be 300 million years old.
The area around Crosskeys is excellent for various outdoor activities. You can find numerous hiking trails, such as the moderate 'Cwmcarn Pond – View of the River Severn loop from Abercarn'. For mountain biking, there are challenging routes like the 'Cafall red trail' at Cwmcarn Trail Centre. Road cycling routes, including the 'Pontymoile Basin – Monmouthshire Canal Towpath loop', are also available. You can explore more options in the Hiking around Crosskeys, MTB Trails around Crosskeys, and Road Cycling Routes around Crosskeys guides.
While specific leash rules vary, many natural areas in Wales, including hills and summits like Twmbarlwm Hill and Mynydd Machen Summit, are generally accessible for dogs, especially on trails. It's always recommended to keep dogs under control, particularly around livestock or wildlife, and to check local signage for any specific restrictions.
For Mynydd Machen Summit, there is plenty of free parking available in Machen, conveniently located next to the village hall and library.
The Crosskeys region is characterized by a landscape of prominent hills, summits, and rolling plateaus. You'll find natural formations like Twmbarlwm Hill and Mynydd Twyn-glas, which offer diverse experiences from panoramic views to ancient landmarks. The area also includes natural reserves like Wern Ddu Clay Pit Nature Reserve with its exposed geological features and forest.
The best time to visit often depends on the activity. For hiking and enjoying views, spring and autumn offer pleasant temperatures and clear skies. Summer is also popular, though it can be busier. Winter walks can be beautiful, especially on clear days, but some trails might be muddy or slippery. Always check local weather conditions before your visit.
While Twmbarlwm Hill and Mynydd Machen Summit are well-known, the Trig point at Mynydd Twyn-glas summit offers a sprawling, rolling plateau with amazing views that might be less frequented than the more prominent hills. Wern Ddu Clay Pit Nature Reserve is also a unique spot for those interested in geology and nature.
Visitors particularly enjoy the stunning panoramic views from the summits, the rich history and folklore associated with sites like Twmbarlwm Hill, and the diverse opportunities for outdoor activities. The komoot community has shared 26 photos and given 59 upvotes, highlighting the scenic beauty and engaging experiences these natural monuments offer.
Generally, no specific permits are required for hiking or casual biking on public rights of way and designated trails in the natural monument areas around Crosskeys. However, for organized events or specific activities like mountain biking at dedicated trail centers (e.g., Cwmcarn), it's always advisable to check their official websites for any specific requirements or fees.


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