4.4
(13)
122
riders
12
rides
Mountain biking around Alwen Reservoir offers a network of trails within the Hiraethog Forest and surrounding moorlands in North Wales. The area features diverse terrain, including wide forest roads, single gravel trails, and narrower tracks, with routes largely free of cars. The reservoir itself is the largest man-made lake in Wales, and the trails often provide views of the water and distant Eryri National Park mountains. Connectivity to Llyn Brenig extends the riding possibilities, with undulating terrain and varied climbs…
Last updated: May 20, 2026
4.0
(2)
23
riders
48.1km
04:06
740m
740m
Moderate mountain bike ride. Good fitness required. Advanced riding skills necessary.
2
riders
44.3km
03:35
580m
580m
Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.

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5.0
(1)
4
riders
17.5km
01:39
310m
310m
Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.
3.0
(1)
5
riders
51.4km
04:29
830m
830m
Moderate mountain bike ride. Good fitness required. Advanced riding skills necessary.
4.0
(2)
5
riders
24.0km
02:07
340m
330m
Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.
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Though it was not a tough or technical ride, it did take me into territory I had never visited before and was a lovely antidote to the 'fleshpots' of Gwydir Forest or Coed-y-Brenin. Some lovely gentle singletrack, beautiful views and I didn't see another rider for the whole trip - although tbh I did set off at 08.30 on a Wednesday!!
1
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Alwen Reservoir is the largest human-made lake in Wales and it makes for a lovely walk. There's a car park at its eastern end and the 6-mile (10 km) loop of the reservoir is wonderfully scenic and suitable for the whole family. The mixture of lake views, woodland and open moorland make it a real treat.
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This bridge across the 900-acre (364 ha) Alwen Reservoir enables a beautiful and tranquil loop of the Wales' largest artificial lake. The views across the water and to the surrounding woodland and hills are lovely.
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Explore over 2500 acres of forest, moorland and lakes amid stunning upland scenery. With visitor centre, café, gift shop, osprey exhibition, adventure playground, cycle hire, mountain biking, walking trails, sailing and world class fishing to discover. Perfect cycling conditions for all ages and abilities. Hire from a wide range of bikes or bring your own ride. Enjoy a gentle family ride on an e-bike or an exhilarating mountain bike adventure.
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Llyn Brenig is a reservoir located on Denbigh Moors in North Wales. The artificial lake, which was constructed between 1973 and 1976, was created by building an embankment dam across the Afon Brenig valley. It lies at 1,200 ft above sea level on the border between the counties of Conwy and Denbighshire.
2
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An easy route for all abilities
0
0
An easy route for all the family to enjoy, although you might want to go int he warmer months of the year. It can be very wet and windy up here in the Winter.
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There are over 10 mountain bike trails around Alwen Reservoir, offering a range of experiences from easy to moderate difficulty. The area is known for its car-free routes and diverse terrain within the Hiraethog Forest.
The trails feature a mix of surfaces, including wide forest roads, single gravel trails, and narrower tracks. You'll encounter undulating terrain with some climbs and descents, providing varied riding through conifer forests, moorlands, and along the reservoir's edge.
Yes, there are several easy routes perfect for beginners and families. For example, the Alwen Trail itself is largely graded as easy to moderate. One specific easy route is Llyn Brenig Dam – Llyn Brenig loop from Llyn Brenig Visitor Centre, which is 13 miles (20.9 km) long.
Absolutely. For experienced riders seeking a longer adventure, routes like A circuit of Clocaenog Forest and the Alwen and Brenig Reservoirs offer a substantial 29.9 miles (48.1 km) ride through extensive forest, linking both reservoirs. Another challenging option is Llyn Brenig Visitor Centre – Llyn Brenig loop from Llyn Brenig Visitor Centre, which is 30.8 miles (49.6 km) long.
You'll encounter diverse scenery, from the tranquil waters of Alwen Reservoir (the largest man-made lake in Wales) to the expansive Hiraethog Forest and moorlands. The historic Alwen Dam, with its Italian-style valve tower, is a notable architectural feature. Many trails offer stunning views across the reservoir and towards the distant Eryri National Park (Snowdonia) mountains. Keep an eye out for local wildlife, including rare birds and elusive red squirrels.
Yes, many routes around Alwen Reservoir are circular. The Alwen Trail itself is a popular circular route around the reservoir. A great example is Alwen Dam – View of Alwen Reservoir loop from Alwen Dam, a 10.9 miles (17.5 km) trail that provides a scenic loop through varied terrain.
Yes, the Alwen Trail connects to the nearby Llyn Brenig via the 'Two Lakes Link Trail' and the 'Two Lakes Trail'. This allows for extended routes, offering up to 14.1 miles of additional riding and enhancing the overall visitor experience with more amenities at Llyn Brenig.
Yes, parking is available at Alwen Reservoir, often near the Alwen Dam, which serves as a common starting point for many trails. Specific parking details can usually be found on local signage or visitor information boards upon arrival.
While Alwen Reservoir itself has limited direct facilities, the nearby Llyn Brenig, which is connected by trails, offers a visitor center with amenities such as a café and toilets. This makes it a convenient stop for refreshments and facilities during a longer ride connecting the two lakes.
Generally, dogs are welcome on trails in the Hiraethog Forest and around Alwen Reservoir, but they should be kept under close control, especially near livestock or wildlife. Always check local signage for any specific restrictions or requirements, particularly regarding lead usage.
The mountain bike trails around Alwen Reservoir are highly rated by the komoot community, with an average score of 4.4 stars from over 10 reviews. Riders often praise the quiet, car-free routes, the diverse terrain, and the stunning views across the reservoir and surrounding moorlands.
The trails are enjoyable year-round, but spring and autumn offer particularly pleasant conditions with milder temperatures and beautiful scenery. Summer is also popular, while winter rides can be invigorating, though appropriate gear for potentially wet and cold conditions is essential.
Yes, the trails offer numerous viewpoints. As you cycle, you'll find elevated positions on the moorlands providing stunning panoramas across Alwen Reservoir and towards the distant Eryri National Park mountains. The Alwen Dam itself also offers impressive views of the lake and surrounding landscape.


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