4.3
(159)
1,476
hikers
52
hikes
Hikes around Llyn Clywedog explore the landscape of a man-made reservoir in the Cambrian Mountains of Mid Wales. The region is characterized by rolling hills, dense forests, and the Clywedog Dam, the tallest mass concrete dam in Britain. The trails offer views across the water and into the narrow, winding valleys of the surrounding area.
Last updated: June 25, 2026
4.0
(11)
63
hikers
5.21km
01:35
160m
160m
Easy hike. Great for any fitness level. Easily-accessible paths. Suitable for all skill levels.
5.0
(3)
29
hikers
3.31km
01:12
200m
200m
Easy hike. Great for any fitness level. Easily-accessible paths. Suitable for all skill levels.

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3.0
(1)
7
hikers
5.14km
01:29
130m
120m
Easy hike. Great for any fitness level. Easily-accessible paths. Suitable for all skill levels.
4
hikers
5.30km
01:39
200m
200m
Easy hike. Great for any fitness level. Easily-accessible paths. Suitable for all skill levels.
5.0
(1)
4
hikers
11.3km
03:17
290m
290m
Moderate hike. Good fitness required. Easily-accessible paths. Suitable for all skill levels.
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Great hike but lots of fallen trees so made it much harder and longer
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This is a historic mining site, with activity dating back to the Bronze Age. The 18th century was its heyday, with silver, zinc and lead all being mined here. It's also the site where the Banc Ty'nddôl sun-disc was discovered in 2002. Over 4,000 years old, this gold disc is the earliest such artefact ever unearthed in Wales.
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Llyn Clywedog is a reservoir created by the construction of the Clywedog Dam. As well as regulating the flow of the River Severn, the reservoir also provides drinking water to the West Midlands. The llyn is a great place to spot some impressive bird species. Red kites and buzzards are common here, while ospreys have occasionally been sighted.
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Built primarily to regulate the flow of water in the River Severn, the Clywedog Dam is an impressive sight. It's the tallest concrete dam in Britain, at 236 feet (72 m) high, while it's also 750 feet (230 m) wide. There are two marked hiking trails on the reservoir.
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Llyn Clywedog was the Tallest in the British Isle built purposely to control the level of water to help prevent any future flooding from the source of the River Seven. By Building this absolutely incredible huge 6 mile long dam, one that was the tallest in the British isles, which is amazingly huge in actual size all around! This mammoth body of water is solely to take the huge pressure off the constant mass of floods which would fill up and submerge the surrounding valleys! At the foot of the dam there is a remains of a old lead mine! All structures you can see standing still today. HIGHLY RECOMMEND
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Bryn y Fan is a prominent summit in mid Wales standing at 482m above the Llyn Clywedog reservoir. There is a nice trig point and great views. It's a bit of an outlier and you're unlikely to see many people on your walk.
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Llyn Clywedog is a man made reservoir built between 1965 and 1967 to help regulate the flow of water in the Severn. It's also used to reduce the risk of flooding up and downstream. Amusing comparison but the lake holds the equivalent of 264 billion glasses of water or 550 million baths. The area around the lake is a well kept habitat for many birds and animals including recent visits from ospreys. The lake is well stocked with trout and a popular fishing destination.
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The main car park is at the Llyn Clywedog Viewpoint, located right by the dam. This is a popular and convenient starting point for many walks and offers excellent views. You'll also find amenities like toilets and a seasonal cafe nearby. For trails in the adjacent Hafren Forest, there are dedicated car parks, such as the one for the Source of the Severn walk.
Yes, dogs are welcome on most trails, but they should be kept on a lead, especially near livestock. The area is home to ground-nesting birds, including protected ospreys, so it's important to keep dogs under close control to avoid disturbing the local wildlife. Always be prepared to clean up after your pet.
Absolutely. For a straightforward and rewarding hike, consider the Bryn y Fan Summit Trig Point – Bryn y Fan Summit loop from Bwlch y Gle Dam. It's a relatively short walk of about 3.3 km that leads to a summit with fantastic views over the reservoir, making it a great option for families and casual walkers.
The trails vary from well-maintained paths and gravel tracks to more rugged, grassy hill paths. Some sections, particularly on higher ground or along the Glyndŵr's Way, can be narrow and uneven. The area is exposed to the elements, so paths can become muddy and slippery after rain. Waterproof hiking boots are recommended.
Yes, there are several excellent circular routes. For a moderate day out, the Clywedog Dam – Clywedog Reservoir loop from Y Fan is a great choice. This 11 km loop provides a comprehensive tour of the area, taking you along the reservoir's shore and over the surrounding hills for varied scenery.
The area is a haven for wildlife. Keep an eye on the sky for birds of prey like red kites and buzzards. Llyn Clywedog is also a nesting site for ospreys, which can sometimes be seen fishing in the reservoir. The surrounding woodlands are home to various smaller birds, while the grasslands attract butterflies in the warmer months.
The Clywedog Gorge Trail offers a fascinating walk through the area's industrial heritage. The path explores the remains of the Bryntail Lead Mines, which are located in the valley just below the impressive Clywedog Dam. It's a relatively easy walk that combines natural scenery with historical interest.
Glyndŵr's Way passes directly through the Llyn Clywedog area. The trail runs beneath the dam and then follows the southern shore of the reservoir. This section is known for its panoramic views across the water and the dramatic 'dragon's back' ridge, offering a more challenging hiking experience.
Yes, if you want to focus on the dam, the Clywedog Dam loop from Y Fan is an ideal choice. This 5.3 km walk provides excellent views of the dam, which is the tallest mass concrete dam in Britain, and the surrounding landscape without being overly strenuous.
The trails around Llyn Clywedog are highly regarded by the komoot community. Reviewers frequently praise the stunning, wide-open vistas across the reservoir and the Cambrian Mountains. The mix of scenery, from the impressive dam structure to the peaceful forests and rugged hills, is another commonly highlighted feature.
Yes, for a walk that delves into the region's past, the Cwmystwyth mines loop from Y Fan is perfect. This 5.1 km trail takes you through a landscape shaped by historic lead mining, offering a unique perspective on the area's industrial heritage alongside its natural beauty.
For a guaranteed spectacular view, head to the main Llyn Clywedog Viewpoint near the dam. For views earned by hiking, the summits of Yr Allt and Bryn y Fan offer panoramic vistas over the entire reservoir and the rolling Welsh hills. Many points along the Glyndŵr's Way trail also provide excellent photo opportunities.


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