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United Kingdom
Wales
South Wales

Crumlin

Top 9 Natural Monuments around Crumlin

Best natural monuments around Crumlin offer diverse landscapes for outdoor exploration. The region features a mix of hills, summits, and reservoirs, providing various natural features near Crumlin. These natural landmarks Crumlin are characterized by their scenic views and opportunities for hiking. Visitors can find several natural monuments around Crumlin that cater to different activity levels.

Best natural monuments around Crumlin

  • The most popular natural monuments is Twmbarlwm Hill and Iron Age hillfort, a historical site and natural monument that…

Last updated: May 19, 2026

Twmbarlwm Hill and Iron Age hillfort

Highlight • Historical Site

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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Mynydd Machen Summit

Highlight • Viewpoint

Mynydd Machen is a 1,188-foot (362 m) hill in South Wales which affords glorious views over Newport, Cardiff, Steep Holm, Flat Holm, Brean Down, and the Severn Estuary. The summit …

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Llandegfedd Reservoir

Highlight • Natural Monument

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 …

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Trig point at Mynydd Twyn-glas summit

Highlight • Natural Monument

Mynydd Twyn-glas is a sprawling 472-metre-high mountain extending into Caerphilly and Torfaen county boroughs in South Wales. It lies southwest of Pontypool, west of Cwmbran and east of Newbridge and …

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Parc Cwm Darran Waterfall

Highlight • Natural Monument

Easy to miss, the waterfall is off the main tarmac road approach to the south side of the lake. It can dry up completely in Summer.

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Tips from the Community

Peter Turner
July 9, 2025, Mynydd Machen Summit

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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Adie
January 12, 2023, Llandegfedd Reservoir

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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Easy to miss, the waterfall is off the main tarmac road approach to the south side of the lake. It can dry up completely in Summer.

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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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Frequently Asked Questions

What natural features can I expect to see around Crumlin?

The Crumlin area offers a variety of natural features, primarily centered around Crumlin Glen and the Crumlin River. Crumlin Glen is a picturesque wooded valley with diverse flora, steps, and waterfalls. The Crumlin River, flowing through the glen, features small pools and stretches of swiftly flowing water. You can also find hills and summits in the broader region, offering scenic views.

Are there historical sites among the natural monuments in Crumlin?

Yes, Crumlin Glen itself holds historical interest. Within the glen, you can find the unique Cockle House, an arched dwelling with a fascinating backstory. Additionally, remnants of the old Crumlin Glen Mill showcase the region's industrial past amidst the natural landscape. For a broader historical perspective, the guide also mentions Twmbarlwm Hill and Iron Age hillfort, a 419 m hill rich in beauty, history, and folklore, though it is located further afield.

What kind of walking trails are available at Crumlin Glen?

Crumlin Glen features well-maintained walking trails, including a popular 1.3-mile loop. These trails wind through a diverse area of mixed woodland, offering opportunities to explore hilly terrain, steps, and scenic spots along the Crumlin River. For more details on the walking routes, you can visit Antrim and Newtownabbey Borough Council's website.

Is Crumlin Glen suitable for families?

Yes, Crumlin Glen is an excellent choice for families. It offers a serene environment for hiking and immersing oneself in nature. Convenient amenities like accessible parking, toilets, and picnic areas make it an ideal spot for a day trip with children. The 1.3-mile loop trail is generally manageable for various ages.

Can I go fishing in the Crumlin River?

Yes, the Crumlin River is recognized as a game fishery and is a popular destination for angling. It's known for its healthy population of native brown trout, and during late summer and early autumn, you might also find Dollaghan (a unique trout breed) and occasionally salmon. Fly, spinner, and worm fishing are permitted. For more information on angling, you can check Antrim and Newtownabbey Borough Council's website.

What wildlife might I spot in Crumlin Glen?

Crumlin Glen is a haven for wildlife. Visitors have opportunities to observe diverse plant life, including wildflowers and ferns. Keep an eye out for various bird species such as kingfishers and dippers, and you might even spot red squirrels in the wooded areas.

Are there any waterfalls to visit near Crumlin?

Yes, Crumlin Glen features the Crumlin Glen Waterfalls, which enhance the visual appeal of the area. While modest in size, they add to the picturesque scenery of the glen. Further afield, Parc Cwm Darran Waterfall is another natural monument, though it can dry up completely in summer.

What are the best times of year to visit the natural monuments in Crumlin?

The natural monuments around Crumlin, particularly Crumlin Glen, are enjoyable year-round. Spring and summer offer lush greenery, wildflowers, and active wildlife. Late summer and early autumn are ideal for angling in the Crumlin River due to the run of Dollaghan and salmon. While beautiful, some trails, like those at Llandegfedd Reservoir, may have seasonal closures from October to March to protect overwintering wildfowl.

Where can I find parking when visiting Crumlin Glen?

Crumlin Glen offers accessible parking facilities, making it convenient for visitors arriving by car. There are also picnic areas and toilets available on-site.

What other outdoor activities can I do near Crumlin's natural monuments?

Beyond exploring the natural monuments themselves, the area around Crumlin offers various outdoor activities. You can find numerous routes for mountain biking, running, and gravel biking. For specific trails and difficulties, explore the MTB Trails around Crumlin, Running Trails around Crumlin, and Gravel biking around Crumlin guides.

What do visitors particularly enjoy about the natural monuments around Crumlin?

Visitors appreciate the serene environment and the opportunity to immerse themselves in nature. The diverse landscapes, from wooded glens to scenic summits, provide excellent opportunities for hiking and enjoying picturesque views. The historical elements, like the Cockle House in Crumlin Glen, also add a unique dimension to the natural beauty.

Are there any other notable natural monuments in the broader Crumlin area?

Beyond Crumlin Glen and River, the wider region features several other natural monuments. These include Mynydd Machen Summit, a viewpoint offering glorious views over Newport, Cardiff, and the Severn Estuary, and Llandegfedd Reservoir, which provides a variety of walking trails and great views around its lake and forest.

What should I wear for nature walks in Crumlin?

For nature walks in Crumlin, especially in Crumlin Glen, comfortable walking shoes or trainers are generally sufficient, as many paths are well-maintained. However, if you plan to explore more challenging terrain or visit during wetter seasons, sturdy hiking boots are advisable. Layered clothing is recommended to adapt to changing weather conditions, and waterproofs are always a good idea in Northern Ireland.

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