4.3
(23)
274
riders
10
rides
Mountain biking around Nant Irfon National Nature Reserve offers routes through varied terrain, characterized by river valleys, forested areas, and undulating hills. The region features a mix of natural landscapes, including the Irfon Valley and surrounding woodlands. Mountain bikers can expect routes that navigate through these natural features, often involving climbs and descents. The area provides a setting for exploring the Welsh countryside on two wheels.
Last updated: May 7, 2026
4.3
(7)
88
riders
31.2km
02:58
710m
710m
Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.
5.0
(1)
10
riders
24.2km
02:28
650m
650m
Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.

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3
riders
50.1km
04:36
1,220m
1,220m
Hard mountain bike ride. Very good fitness required. Suitable for all skill levels.
3
riders
44.0km
02:59
650m
650m
Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.
5.0
(1)
11
riders
33.9km
03:09
770m
770m
Moderate mountain bike ride. Good fitness required. Advanced riding skills necessary.
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Popular around Nant Irfon National Nature Reserve
A quick detour off the gravel road up a grassy hill, where you will find a circle of standing stones with a beautiful backdrop!
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It's a truly stunning ride valley mountain road and not to be missed if you are in the area.
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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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Devil’s Staircase is a climb for mountain bike type gears and an advantage for those that can ride out of the saddle .My attempts have failed miserably,best of luck.
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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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Coed Nant - the - sow 505m P40 (1657ft) Welsh Dewey and Dodd summit
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What an beautiful valley and with many great swimming spots its my favourite
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The mountain bike trails in this area primarily cater to moderate and difficult skill levels. There are 7 moderate routes and 3 difficult routes available. Riders should be prepared for varied terrain, including climbs and descents through river valleys and woodlands.
While there are no trails specifically categorized as 'easy' in the immediate area, some of the shorter moderate routes might be suitable for families with older, experienced children. For example, the Caffi Sosban loop from Llanwrtyd is a moderate 15.1-mile route that offers a mix of terrain without extreme technical challenges.
Advanced riders looking for a challenge can explore routes like the Abergwesyn Pass – Llyn Brianne Dam loop from Llanwrtyd. This difficult 31.1-mile trail features significant elevation changes and leads through mountain passes, offering a demanding ride.
Trail durations vary depending on the route and your pace. For instance, the Arfon Forest – Caffi Sosban loop from Llanwrtyd, a 19.4-mile moderate trail, typically takes around 2 hours 58 minutes. Longer, more difficult routes, such as the Abergwesyn Pass – Llyn Brianne Dam loop from Llanwrtyd (31.1 miles), can take approximately 4 hours 36 minutes.
Yes, many of the routes in the area are circular, allowing you to start and finish in the same location. Examples include the popular Arfon Forest – Caffi Sosban loop from Llanwrtyd and the Doethie Valley and Llyn Brianne loop.
The best time for mountain biking in this Welsh nature reserve is generally from late spring through early autumn (May to October). During these months, you can expect milder weather, longer daylight hours, and drier trail conditions, making for a more enjoyable ride. Winter riding is possible but requires appropriate gear and caution due to potentially wet, muddy, and icy conditions.
The trails often pass through diverse landscapes. You might encounter features like the dramatic Abergwesyn Valley, the challenging Devil's Staircase Climb (Abergwesyn), or the scenic Wolf's Leap on the River Irfon. There are also viewpoints offering expansive vistas, such as the View Over Abergwesyn Common.
Many trails in the area are suitable for dogs, provided they are well-behaved and kept under control, especially around livestock. As a National Nature Reserve, it's important to follow the Countryside Code, which includes keeping dogs on a lead near wildlife and farm animals. Always check specific trail regulations or local signage for any restrictions.
Many routes, such as those starting from Llanwrtyd Wells, offer convenient parking options within or near the town. While specific car parks are not detailed in the route descriptions, Llanwrtyd Wells serves as a common starting point and typically has facilities for visitors.
The area is highly rated by the komoot community, with an average score of 4.3 stars from 23 reviews. Reviewers often praise the varied terrain, the challenging climbs, and the stunning natural beauty of the Welsh countryside, particularly the river valleys and dense woodlands.
Several routes start or pass through Llanwrtyd Wells, which is known for its local amenities, including pubs and cafes. For example, the Caffi Sosban loop from Llanwrtyd is named after a local cafe, suggesting proximity to refreshments. It's a good idea to plan your route to include a stop in the town for a break.
Nant Irfon National Nature Reserve, like much of Wales, can experience changeable weather. Expect mild to warm temperatures in summer, but be prepared for rain at any time of year. Winters can be cold and wet, with potential for ice or snow at higher elevations. Always check the local forecast before heading out and dress in layers.


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