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Llyn Clywedog

The best walks and hikes around Llyn Clywedog

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.

Best hiking trails around Llyn Clywedog

  • The most popular hiking route is the Clywedog Dam – Yr Allt Summit Path loop from Y Fan, a 3.2 mile (5.2 km) trail that takes around 1 hour 35 minutes to complete. This easy route features views of the dam and the surrounding hills.
  • Another top favourite among local hiking enthusiasts is the Bryn y Fan Summit Trig Point – Bryn y Fan Summit loop from Bwlch y Gle Dam, an easy 2.1 mile (3.3 km) path. The route involves a climb to the Bryn y Fan summit for views over the reservoir.
  • Local hiking enthusiasts also love the Cwmystwyth mines loop from Y Fan, a 3.2 mile (5.1 km) trail leading through a historic mining landscape, often completed in about 1 hour 30 minutes.
  • Hiking around Llyn Clywedog is defined by reservoir-side paths, forested sections, and open hilltops. The network of Llyn Clywedog walking trails offers options for different ability levels, from gentle walks to more challenging sections of National Trails like Glyndŵr's Way.
  • The routes in Llyn Clywedog are highly rated by the komoot community with an average score of 4.4 stars from more than 120 reviews. More than 1,100 hikers have used komoot to explore Llyn Clywedog's varied terrain.

Last updated: June 25, 2026

4.0

(11)

63

hikers

#1.

Clywedog Dam – Yr Allt Summit Path loop from Pen-Y-Gaer

5.21km

01:35

160m

160m

Easy hike. Great for any fitness level. Easily-accessible paths. Suitable for all skill levels.

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Easy

5.0

(3)

29

hikers

Easy hike. Great for any fitness level. Easily-accessible paths. Suitable for all skill levels.

Easy
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3.0

(1)

7

hikers

Easy hike. Great for any fitness level. Easily-accessible paths. Suitable for all skill levels.

Easy

4

hikers

Easy hike. Great for any fitness level. Easily-accessible paths. Suitable for all skill levels.

Easy

Moderate hike. Good fitness required. Easily-accessible paths. Suitable for all skill levels.

Moderate
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Popular around Llyn Clywedog

Cycling around Llyn Clywedog

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Tips from the Community

Jason
April 15, 2026, Picnic Table With View of River Valley

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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Alex Foxfield
October 22, 2025, Llyn Clywedog

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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Alex Foxfield
October 22, 2025, Clywedog Dam

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.

1

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Ronnie
February 25, 2024, Bryn y Fan Summit

Bryn y Fan 482m P175 (1581ft) Welsh Marilyn

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0

Zoe Evans
October 28, 2023, Clywedog Dam

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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51m
December 8, 2022, Bryn y Fan Summit

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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Frequently Asked Questions

Where is the best place to park for hikes around Llyn Clywedog?

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.

Are the walking trails around Llyn Clywedog suitable for dogs?

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.

Are there any easy, family-friendly walks available?

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.

What are the trail conditions like around the reservoir?

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.

Can I do a circular walk around Llyn Clywedog?

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.

What wildlife might I see while hiking?

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.

Tell me more about the Clywedog Gorge Trail.

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.

Which parts of the Glyndŵr's Way National Trail are near the reservoir?

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.

Are there any walks that focus on the Clywedog Dam itself?

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.

What do other hikers enjoy most about the trails here?

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.

Are there any hikes that explore the area's mining history?

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.

Where can I find the best viewpoints?

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.

Most popular routes around Llyn Clywedog

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