4.3
(24)
290
riders
16
rides
Mountain biking around Llyn Brianne offers routes through a landscape shaped by the large reservoir, dense forests, and the valleys of the Cambrian Mountains. The area features a mix of forest tracks, gravel paths, and more technical singletrack, providing varied terrain for mountain bikers. Rolling hills and river valleys characterize the region, with routes often following the contours of the land and offering views of the water. The trails primarily traverse woodland and open moorland, with elevation changes typical of the Welsh uplands.
Last updated: June 21, 2026
5.0
(1)
12
riders
33.9km
03:09
770m
770m
Moderate mountain bike ride. Good fitness required. Advanced riding skills necessary.
2.0
(2)
36
riders
Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.

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8
riders
61.8km
05:54
1,340m
1,340m
Hard mountain bike ride. Very good fitness required. Suitable for all skill levels.
2
riders
37.5km
03:06
700m
700m
Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.
3.0
(1)
5
riders
49.5km
04:41
1,200m
1,200m
Hard mountain bike ride. Very good fitness required. Advanced riding skills necessary.
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Cwm R MTB trail is completely blocked at top end due to hundreds of wind fallen trees this winter. Please consider before as you can not navigate loop.
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A short climb up from the road brings you to the Dam and carpark, there is no access over the Dam itself. But you do get a good view over the spillway and valley below.
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Built in 1913 the Rhandirmwyn Bridge links the two sides of the Towy valley by this rivetted girder road bridge. On the southern side you'll find the Towy Bridge Inn, a lovely riverside pub.
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THE TALE OF THE WELSH “ROBIN HOOD” Known as Twm Siôn Cati Twm Siôn Cati is a historically known figure in Welsh folklore. A tale recounted by Meyrick recalls how Twm was asked by a poor man to steal a pitcher for him. They went together to a merchant where Twm started belittling the man's wares. Having told his friend secretly to take the pitcher of his choice, Twm distracted the merchant by telling him there was a hole in one of the pitchers, which the man denied. Twm desired him to put his hand in the pitcher to test it and the man still denied there was a hole. Twm then asked him how, if there was no hole, could he have put his hand inside? By this time his friend had disappeared with his pitcher, undetected. A tale from Prichard's book involves an occasion when Twm is staying in an inn overnight and realises other people are planning to rob him the following day after he sets off. He has a large sum of money with him. The following morning he behaves as though his money is in the pack-saddle of his horse. When the highwayman catches up, Twm drops the saddle in the middle of a pool. The highwayman wades into the pool to fetch it, Twm takes the opportunity to make off with the highwayman's horse. A complication arises because the horse responds to the voice of the highwayman crying "Stop!" Luckily Twm, in terror, happens to shout a word which makes the horse gallop on again, and he is conveyed to safety. Another tale recounts how Twm waylaid a rich squire, who was accompanied by his daughter, Twm was so smitten with her that he returned her jewellery to her and attempted to woo her, against her father's opposition and, initially, her own. One full moon shortly after the robbery, he crept to her window, roused her from sleep, caught her hand at the window and kissed it, refusing to let her go until she promised to marry him. She wouldn't promise so Twm drew his dagger, drew blood on her wrist and threatened to sever her hand unless she assented to marriage forthwith. She agreed to marry him and she kept her hand. Their marriage followed soon after, despite her father's views and the directness of Twm's courtship methods. The girl was supposedly the widow of the sheriff of Carmarthen. Through this marriage Twm is supposed to have gained respectability, eventually becoming a justice of the peace, sitting in judgement on others, a position he held until his death aged 79.
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More stunning forestry gravel that links the Tregaron mountain road over towards Tyn y Cornel hostel.
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Mynydd Tywi (Pen y Maen North Top) 548m P90 (1798ft) TP4493 - Black Lake S1580 Welsh Dewey
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Lovely mix of fire road to start with and then a huge climb up and over into a valley that time forgot - perfect single track - although can be a bit muddy in places. Probably best to make sure there has not been too much rain in the week before riding this route - and in the winter be prepared for quick changes of weather and plummeting temperatures.
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There are 17 mountain bike trails around Llyn Brianne listed on komoot. These routes offer a variety of experiences, from moderate loops to more challenging long-distance rides.
While most of the trails around Llyn Brianne are rated moderate or difficult, there is at least one easy mountain bike route available. These trails typically feature a mix of forest tracks and gravel paths, suitable for those new to mountain biking or looking for a less strenuous ride.
The mountain bike trails in Llyn Brianne traverse a diverse landscape, including forest tracks, gravel paths, and some more technical singletrack sections. You'll ride through dense woodlands, open moorland, and along the contours of the reservoir and river valleys, with elevation changes typical of the Welsh uplands.
Yes, many of the mountain bike routes in Llyn Brianne are circular. For example, the Doethie Valley and Llyn Brianne loop is a popular 21-mile circular trail, and the Twm Siôn Cati's Cave – Llyn Brianne Dam Crossing loop from RSPB Gwenffrwd-Dinas also offers a circular experience.
Parking is available at various points around Llyn Brianne, often near trailheads or popular starting points. For routes like the Twm Siôn Cati's Cave – Llyn Brianne Dam Crossing loop, you can typically find parking facilities near RSPB Gwenffrwd-Dinas. Other routes may have designated parking areas or roadside spots, so it's advisable to check specific route details on komoot for the most convenient options.
The best time for mountain biking in Llyn Brianne is generally from spring through autumn (April to October) when the weather is milder and trail conditions are typically drier. While winter riding is possible, be prepared for colder temperatures, potentially wet and muddy trails, and shorter daylight hours.
Absolutely. The trails offer numerous scenic viewpoints overlooking the Llyn Brianne reservoir and the surrounding Cambrian Mountains. Routes often pass through the picturesque Doethie Valley and near the Llyn Brianne Dam. The Waterfall Viewpoint loop from RSPB Gwenffrwd-Dinas specifically highlights a beautiful waterfall.
Yes, Llyn Brianne is rich in wildlife. The area, particularly around RSPB Gwenffrwd-Dinas, is known for its birdlife, including red kites. You might also encounter various woodland creatures and observe the diverse flora of the Welsh uplands while on the trails.
While many trails are moderate to difficult, families with some biking experience can find suitable options, especially on the less technical forest tracks and gravel paths. It's recommended to choose shorter, easier routes and always check the difficulty rating and distance before heading out with children.
The area is highly rated by the komoot community, with an average score of 4.3 stars from over 20 reviews. Reviewers often praise the quiet woodlands, the varied terrain, and the stunning views of the reservoir and valleys. Many appreciate the sense of wilderness and the well-maintained forest tracks.
While Llyn Brianne is a remote area, there are a few options for refreshments. The The Towy Bridge Inn – Cwm Rhaeadr Forest Track loop, for instance, starts near The Towy Bridge Inn, which can be a convenient stop for food and drink before or after your ride. It's always a good idea to check opening times in advance.
For experienced riders seeking a challenge, the Llyn Brianne Dam – Llyn Brianne Dam Crossing loop from RSPB Gwenffrwd-Dinas is a difficult 38.8-mile trail that leads through varied forest and open terrain, often taking over 6 hours to complete. These routes feature significant elevation changes and more demanding sections.


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