Natural monuments around Croesyceiliog are primarily found in the surrounding Torfaen and Caerphilly County Borough areas, as Croesyceiliog itself is a residential suburb. This region features a landscape characterized by hills, valleys, and reservoirs, offering various outdoor exploration opportunities. The area provides access to significant natural attractions known for their geological features and historical importance. Visitors can explore a range of natural settings, from prominent hill summits to expansive bodies of water.
Last updated: May 19, 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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Be aware that if you come down to the dam on the lake you can't escape through the valley, there's a gate on both of these minor roads coming down off the dam with some very threatening signs. You have to take on one of the bastard ramps, east or west doesn't matter, they're both brutal, though I can imagine eastward is worse.
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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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A lovely place with great views, with a variety of walking trails on offer. Please note that the majority of the trails are closed annually from 1st October to 1st March, this is to protect over-wintering wildfowl, for which the area has been designated an SSSI.
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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 area around Croesyceiliog, particularly in Torfaen and Caerphilly County Borough, offers diverse natural features. You can find prominent hill summits like Twmbarlwm Hill and Mynydd Machen Summit, which provide expansive views. There are also significant bodies of water such as Llandegfedd Reservoir, featuring a lake and surrounding forest.
Yes, Twmbarlwm Hill and Iron Age hillfort is a significant historical natural monument. It features the remains of an ancient Iron Age hillfort with earthworks and ramparts, indicating its past as a settlement. The hill is rich in local folklore and offers a glimpse into Celtic history.
For breathtaking panoramic views, consider visiting Mynydd Machen Summit, which offers magnificent vistas encompassing Newport, Cardiff, Steep Holm, Flat Holm, Brean Down, and the Severn Estuary. Twmbarlwm Hill also provides wonderful views of the Severn Estuary and surrounding valleys.
Absolutely. Llandegfedd Reservoir is a great family-friendly option, offering various walking trails around the lake and forest. Another spot is Llanfrechfa Grange Park Tree, located within a historical park that was once home to a large mansion.
The region offers various outdoor activities. You can find numerous hiking trails, from easy strolls to more challenging routes. For specific hiking options, explore the Hiking around Croesyceiliog guide or the Easy hikes around Croesyceiliog guide. If you're into cycling, there are also options for Gravel biking around Croesyceiliog.
Llandegfedd Reservoir is notable for its beautiful lake and forest setting, offering scenic views and a variety of walking trails. It is also designated as a Site of Special Scientific Interest (SSSI) due to its importance for overwintering wildfowl.
When planning a visit to Llandegfedd Reservoir, be aware that the majority of its trails are closed annually from October 1st to March 1st. This closure is in place to protect the overwintering wildfowl for which the area is designated an SSSI.
Yes, Mynydd Machen Summit is recognized as an excellent location for technical trail running, with numerous footpaths winding through its hilly terrain. Its challenging routes offer a rewarding experience for experienced runners.
Mynydd Twyn-glas summit is a sprawling 472-meter-high mountain that extends into Caerphilly and Torfaen county boroughs. It offers amazing views from its broad shoulder, known as Mynydd Maen, and its northern slopes are thickly afforested with conifer plantations, making it a distinctive natural landmark.
Visitors frequently praise the expansive and panoramic views from the hill summits, such as those found at Twmbarlwm Hill and Mynydd Machen Summit. The variety of walking trails, the natural beauty of places like Llandegfedd Reservoir, and the historical significance of sites like the Iron Age hillfort are also highly appreciated.
There is plenty of free parking available in Machen, conveniently located next to the village hall and library, making it a good starting point for exploring Mynydd Machen Summit.


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