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MTB trails
United Kingdom
Wales
Powys

Lake Vyrnwy

The best MTB trails around Lake Vyrnwy

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.

Best mountain bike trails around Lake Vyrnwy

  • The most popular mountain bike trail is Giants of Vyrnwy – Lake Vyrnwy Dam loop from Lake Vyrnwy, a 17.1 miles (27.5 km) trail that takes 2 hours 23 minutes to complete. This moderate route offers scenic views of the historic Lake Vyrnwy Dam and the expansive reservoir.
  • Another top favourite among local mountain bikers is Coed Fachwen loop from Penyffordd Car Park, a moderate 13.7 miles (22.0 km) path. This route winds through forest tracks and offers a good mix of climbs and descents.
  • Local mountain bikers also love the Hirnant Pass – Y Groes Fagl Summit loop from Foel y Ddinas, a 9.3 miles (14.9 km) trail leading through mountainous terrain, often completed in about 1 hour 33 minutes.
  • Mountain biking around Lake Vyrnwy is defined by its dramatic reservoir, surrounding mountains, and extensive forests. The network offers options for different ability levels, from leisurely rides to challenging climbs.
  • The routes in Lake Vyrnwy are highly rated by the komoot community with an average score of 5.0 stars from more than 5 reviews. More than 100 mountain bikers have used komoot to explore Lake Vyrnwy's varied terrain.

Last updated: June 28, 2026

5.0

(3)

11

riders

#1.

Giants of Vyrnwy – Lake Vyrnwy Dam loop from Abertridwr

28.8km

02:46

720m

720m

Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.

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Moderate

Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.

Moderate
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Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.

Moderate

Hard mountain bike ride. Very good fitness required. Suitable for all skill levels.

Hard

Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.

Moderate

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Cycling around Lake Vyrnwy

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Tips from the Community

Alex Foxfield
October 22, 2025, Llanwddyn

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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embee999
September 26, 2024, Lake Vyrnwy Dam

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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Frequently Asked Questions

How varied are the mountain bike trails around Lake Vyrnwy?

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.

Are there mountain bike trails suitable for beginners or families at Lake Vyrnwy?

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.

What kind of elevation changes can I expect on the mountain bike trails?

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.

When is the best time of year to go mountain biking in Lake Vyrnwy?

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.

What natural features can I discover while mountain biking around Lake Vyrnwy?

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.

Are there any historical landmarks or unique attractions to see along the trails?

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.

Can I spot any wildlife while mountain biking in the area?

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.

Is there parking available for mountain bikers at Lake Vyrnwy?

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.

How accessible is Lake Vyrnwy by public transport for mountain bikers?

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.

Are there any circular mountain bike routes around Lake Vyrnwy?

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.

What do other mountain bikers appreciate most about the trails here?

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.

Can I rent a mountain bike near Lake Vyrnwy?

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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