5.0
(6)
45
riders
6
rides
Mountain bike trails around Lake Vyrnwy offer diverse terrain set within the remote Berwyn Mountains in Powys, Wales. The area features a large man-made reservoir encircled by thick forests and heather moorland, providing a mix of well-maintained country lanes and challenging off-road paths. Riders can explore varied landscapes, from the relatively flat 12-mile lake circuit to more demanding routes through surrounding woodlands like Dyfnant Forest. The region's elevation changes and natural features cater to different skill levels, from beginners to advanced mountain bikers.
Last updated: June 28, 2026
5.0
(3)
11
riders
28.8km
02:46
720m
720m
Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.
5.0
(1)
6
riders
22.0km
01:53
440m
440m
Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.

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4
riders
14.9km
01:33
430m
430m
Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.
5.0
(1)
4
riders
42.9km
04:29
1,420m
1,420m
Hard mountain bike ride. Very good fitness required. Suitable for all skill levels.
8
riders
15.2km
01:26
420m
420m
Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.
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Llanwddyn is a small village beneath the Llanwddyn Dam on Lake Vyrnwy. The original village was flooded when the reservoir was created in the 1880s. There are a couple of accommodation options in the surroundings: the beautifully situated Lake Vyrnwy Hotel and Spa to the north-east and the Lake Vyrnwy campsite to the east.
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Gorgeous area. Be aware the road/trail on the south side (including access to/from Llanymawddwy) are currently closed due to damage from storm Darragh. See https://www.hdcymru.co.uk/our-visitor-sites/lake-vyrnwy/storm-darragh/ for more details.
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There is a little cafe above the main car park for a coffee and cake after the "gift shop" labelled walks. As usual, Komoot makes the walk easier than using signposts - remember to download to the phone app. Kayaking/canoeing around the lake is only possible for about half of it due to a protected bird sanctuary.
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The dam across the Vyrnwy Valley, Montgomeryshire, was the first large masonry dam, and was completed in 1888. Water from the reservoir supplies Liverpool, travelling there along a 70 mile aqueduct. They have a bike hire and cafe in the car part. You can hire a bike to ride around the lake the road surface is great with some spectacular views of the lake and dam. The dam at Lake Vyrnwy is often associated with practice bombing runs for Operation Chastise in The Second World War. Better known as the “Dambusters” raid, Lancasters of 617 Squadron breached the German Möhne and Eder dams and damaged the Sorpe dam in May 1943. However, the association with Lake Vyrnwy seems to be something of a local myth as the dam was never actually used for this purpose. So where did this story originate? It seems that at least one scene in the famous 1955 film, “The Dambusters” was shot at Lake Vyrnwy leading to the mistaken belief that the wartime RAF Lancaster bomber crews practiced there.
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Lake Vyrnwy (Welsh: Llyn Efyrnwy, pronounced [ɛˈvərnʊɨ] or Llyn Llanwddyn) is a reservoir in Powys, Wales, built in the 1880s for Liverpool Corporation Waterworks to supply Liverpool with fresh water. It flooded the head of the Vyrnwy (Welsh: Afon Efyrnwy) valley and submerged the village of Llanwddyn.
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Artisans Craft and Coffee shop provides food and drink including hot toasted baguettes, homemade cakes and scones and Kelly's Ice Cream. There is also a bike hire service here if you want to take on the 12 miles (20 km) of scenic road around the lake.
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This scenic well-surfaced track is a pleasant alternative to the road. It cuts through Dynant Forest.
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Great little café to stop off and grab a drink.
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Lake Vyrnwy offers a diverse range of mountain bike trails catering to various skill levels. You'll find everything from relatively flat, well-maintained country lanes suitable for leisurely rides to more challenging off-road paths through surrounding forests like Dyfnant Forest. The region's terrain includes a mix of forest tracks, climbs, and descents, with routes like Giants of Vyrnwy – Lake Vyrnwy Dam loop offering moderate challenges, and others providing more difficult, mountainous experiences.
Yes, Lake Vyrnwy has options for beginners and families. The 12-mile (19 km) circular route around the lake itself is particularly popular, featuring well-maintained, relatively flat country lanes. While komoot lists 6 moderate routes, there are no specifically easy routes identified in the data. However, the lake circuit is widely regarded as family-friendly and accessible for those new to mountain biking.
The elevation changes vary significantly depending on the trail. While the lake circuit is relatively flat, many routes venture into the surrounding Berwyn Mountains and forests, offering substantial climbs. For example, the Giants of Vyrnwy – Lake Vyrnwy Dam loop involves over 560 meters of elevation gain, and the challenging Tomen Cefncoch Motte – Craig Rhiwarth Descent loop features over 1400 meters of ascent, requiring good to very good fitness.
Lake Vyrnwy can be enjoyed year-round, but spring and autumn often offer the most pleasant conditions for mountain biking, with milder temperatures and beautiful scenery. Summer is also popular, though trails can be busier. Winter rides are possible but require appropriate gear for potentially wet and colder conditions, especially on higher elevation routes.
The area is rich in natural beauty. You'll encounter the expansive Lake Vyrnwy itself, surrounded by remote mountains, heather moorland, and thick forests. Keep an eye out for picturesque waterfalls, such as the Rhiwargor Waterfall at the northern end of the lake, and the Nant y Maes Waterfall, which adds to the scenic charm.
Yes, Lake Vyrnwy boasts several notable landmarks. The impressive Lake Vyrnwy Dam, a historic Gothic Revival structure, is a highlight. You can also spot the ornate Lake Vyrnwy Straining Tower in the lake. Below the dam, there's a sculpture park, including the Hand Sculpture of the Tallest Tree in the UK, adding an artistic touch to the natural surroundings.
Lake Vyrnwy is a designated National Nature Reserve and a haven for wildlife. As you cycle, you might spot around 90 breeding bird species, including peregrine falcons and pied flycatchers. The area is also home to six species of bats. There are several bird hides, such as the Centenary Bird Hide, around the lake for dedicated birdwatching.
Yes, parking is available at various points around Lake Vyrnwy. Many routes, such as the Coed Fachwen loop from Penyffordd Car Park, indicate specific starting points with parking facilities. It's advisable to check the specific route details on komoot for the most convenient parking options.
Lake Vyrnwy is nestled in a remote part of the Berwyn Mountains, making direct public transport access somewhat limited. While there are bus routes to nearby towns, reaching the lake itself often requires a car or a combination of public transport and cycling. It's best to plan your journey in advance and check local bus schedules if relying on public transport.
Yes, circular routes are a popular feature of mountain biking in Lake Vyrnwy. The most well-known is the 12-mile (19 km) circular route directly around the lake. Additionally, komoot features several other circular tours, such as the Hirnant Pass – Y Groes Fagl Summit loop, which allows you to start and end your ride at the same point.
The mountain bike trails around Lake Vyrnwy are highly rated by the komoot community, with an average score of 5.0 stars. Reviewers often praise the stunning scenic views of the reservoir and surrounding mountains, the diverse terrain that caters to different skill levels, and the sense of tranquility found within the remote Berwyn Mountains. The well-maintained paths and challenging off-road sections are also frequently highlighted.
Yes, for your convenience, bike hire is available near the Lake Vyrnwy Dam. This allows visitors who don't bring their own bikes to still enjoy the various cycling and mountain biking opportunities the area offers.


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