Best mountain passes around Honddu Isaf are located in a rural community in the valley of the lower River Honddu in Powys, Wales. This area serves as a base for exploring the surrounding mountainous regions of the Brecon Beacons National Park. The landscape features winding roads, challenging inclines, and diverse natural features.
Last updated: July 1, 2026
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This is the col between Corn Du and Craig Gwaun Taf. Not only is it a fine viewpoint, but it is also the parting of the ways. Turn right at the marker stone you will follow the crowds down to the Storey Arms, turn left to Craig Gwaun Taf and you arfe likely to have the airy path all to yourself.
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As you descend to this section to the viewpoint I've shared, please be aware that you have rocks and drops to descend that can be slippery when they are wet.
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Gap Road. This was the first track to enable horse-drawn carriages to cross the mountain range. It's thought to be a Roman road, although no archaeological evidence has been found as yet. Turn right onto the gap road and follow this route all the way back to the car park, and to your starting point.
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The Brecon Beacons well known “THE GAP” is a passing between Crybin and Fan y big in the shadow of Pen y fan. Gap Road which will take you through the Neuadd valley. The Gap Road- is actually an old main Roman road. The Gap provides the first encounter with what I call engineered paths.
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Great views and riding I've only done it on gravel bikes ascending from the south. It's doable fully loaded too. The Brecon descent is proper big gravel and under biking fun. Or do it flat out on an MTB too.
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Managed on a hard tail with Bikepacking bags. Technical climb with a nice decent towards Brecon.
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The climb up to the saddle could be done on a hardtail but would recommend to ride from the saddle towards Brecon on a full sus
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If you are riding a 40mm tyre, loaded gravel bike, I would say the majority of this 5km or so section (not just the lumpy bit near the top) will be easier to walk so bear that in mind if you are attempting it. It’s generally pretty lumpy the whole way and a doable challenge if you are technically good… but you’ll be walking if you aren’t… or if you already have 80km of gravel in the legs like us!! Even a guy we passed on a full sus EMTB had to hike a bike some sections as they aren’t possible to ride. I personally thought we might have an hour of hike a bike… but that quickly turned closer to 3. Absolutely stunning views, a real adventurous challenge. Would like to go back with some chunkier tyres and maybe some suspension!
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While Honddu Isaf itself is a valley community, it serves as an excellent base for exploring the significant mountain passes within the nearby Brecon Beacons National Park. These passes are characterized by winding roads, challenging inclines, and breathtaking vistas of the Welsh landscape, offering opportunities for scenic drives, cycling, and hiking.
Yes, for those interested in history, The Gap Pass (Bwlch ar y Fan) is particularly notable. It's an old Roman road that passes between Cribyn and Fan y Big, offering a unique blend of historical significance and stunning mountain scenery within the Brecon Beacons National Park.
The area is well-known for its cycling opportunities. The Gap Pass is a classic MTB route, topping out at 600 meters above sea level and known for its technical challenges. Another popular spot is The Gap (Bannau Brycheiniog National Park), which lies in the saddle between Pen y Fan and Fan y Big and is a focal point for mountain biking, especially when ridden from south to north for an exhilarating descent.
For expansive views, the Storey Arms Pass (A470) is a highly regarded route through the Brecon Beacons. A stop at the layby just past its summit offers a viewpoint encompassing a large portion of South Wales, including views of Pen y Fan. Additionally, Windy Gap, located between Corn Du and Craig Gwaun Taf, provides a fine viewpoint.
Yes, for a more secluded and rugged experience, consider Bwlch Cerrig Duon, meaning 'pass of the black stones.' This minor road between Trecastle and the Swansea Valley reaches an elevation of 369 meters and is ideal for those seeking less-trafficked routes and unspoiled natural beauty within the Brecon Beacons.
The mountain passes around Honddu Isaf are excellent starting points for various outdoor activities. You can find numerous routes for mountain biking, running, and gravel biking. For example, there are challenging MTB routes like the Talybont on Usk & The Gap loop, and scenic running trails along the Monmouthshire and Brecon Canal. You can explore more options on the MTB Trails around Honddu Isaf, Running Trails around Honddu Isaf, and Gravel biking around Honddu Isaf guide pages.
The terrain on these mountain passes can vary significantly. Many routes feature winding roads and challenging inclines. For instance, sections of The Gap Pass (Bwlch ar y Fan) are described as tough, with large sections unrideable without a full suspension mountain bike due to chunky, stony steps and rocks. Be prepared for varied surfaces, from paved roads to technical off-road trails.
The best time to visit largely depends on your planned activity. Spring and summer offer milder weather, making them ideal for hiking, cycling, and scenic drives. Autumn brings striking seasonal colours, particularly around passes like Bwlch Bryn-rhudd ('pass of the crimson hill'). Winter can offer dramatic, snow-covered landscapes, but conditions can be challenging, requiring appropriate gear and experience for hiking or cycling.
Bwlch Bryn-rhudd, translated as 'pass of the crimson hill,' is located on the A4067. Its name suggests potentially striking geological features or seasonal colours, making it a particularly scenic drive, especially during autumn when the landscape might live up to its 'crimson' description.
Visitors frequently praise the amazing scenery and the sense of accomplishment from tackling challenging routes. Many appreciate the exhilarating descents on mountain biking trails and the blend of history with natural beauty, such as the old Roman road at The Gap Pass (Bwlch ar y Fan). The opportunities for high climbs with rewarding views are also a major draw.
While facilities directly on the passes might be limited, nearby communities often provide amenities. For example, when riding The Gap (Bannau Brycheiniog National Park), starting from the community center in Tal Y Bont offers access to village stores with coffee and hot chocolate, as well as bike wash and hot shower facilities for a small fee.


See even more epic mountain passes by checking out these guides around Honddu Isaf: