3.9
(18)
109
riders
7
rides
Gravel biking around Alzen offers a diverse landscape for exploration. The region features a mix of terrain, including forest trails, white roads, and paths across fields, providing varied experiences for cyclists. The area is characterized by its river valleys and surrounding hills, which contribute to the varied elevation profiles of the routes. These natural features create an environment suitable for no traffic gravel bike trails.
Last updated: July 6, 2026
4.9
(11)
67
riders
Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.
4.7
(3)
14
riders
Moderate gravel ride. Good fitness required. Mostly paved surfaces. Suitable for all skill levels.

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4.0
(2)
10
riders
Moderate gravel ride. Good fitness required. Mostly paved surfaces. Suitable for all skill levels.
2
riders
64.2km
04:48
1,510m
1,510m
Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.
3.0
(1)
3
riders
33.2km
01:59
340m
340m
Moderate gravel ride. Good fitness required. Mostly paved surfaces. Suitable for all skill levels.
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Popular around Alzen
I climbed it from its easier side, the one that starts from Foix and stretches for 28 kms, crossing the Col de Marrous. It's a steady climb, with a few tough kilometers, and very pleasant. It's the side used by the Tour de France to descend it. The best thing about the Mur de Peguère are the views from its summit.
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I can only speak about my experience descending it from the south side, the one that starts in the village of Biert. It's simply a great pass, with a very tough final section, very similar to its close brother Mur de Peguère. With hardly any traffic, it has the appeal that the road is very narrow and very winding, which helps mentally.
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quiet route, rolling towards Foix, steeper towards Saint Martin de Caralp
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Be careful, since yesterday, June 19th, the descent to Rivèrenert has been freshly graveled and dangerous. I had a rear puncture due to small, sharp gravel sticking to the tire when braking. So, don't go crazy on this descent, friends.
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Because around 12pm and >31°C, the climb from Biert is mostly in the shade, and this pass generally ends a series of small linked passes (like Portech, Catchaudégué or La Core, Saraillé, etc.). And the challenge of the last 3 km is worth experiencing to strengthen your mental strength. Get to your pedals
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Old little station that reminds us of another time!
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There are 7 dedicated no-traffic gravel bike trails around Alzen listed in this guide, offering a variety of experiences for different skill levels. You'll find routes ranging from moderate to difficult, ensuring a suitable adventure for many riders.
Yes, several routes are designed as loops to bring you back to your starting point without encountering significant car traffic. For example, the The tunnels of Véloroute 81 – Foix–Saint-Girons Greenway loop from Castelnau-Durban offers a substantial circular ride, and the Vernajoul Viaduct Greenway – Viaduct with Scenic View loop from Saint-Martin-de-Caralp is another excellent option for a car-free loop.
The Alzen region offers diverse and picturesque scenery. You can expect to ride through lush valleys, along rivers, and past historical structures. Many trails feature impressive viaducts and tunnels, providing unique visual experiences. The landscape is characterized by its natural beauty, offering a refreshing escape from urban environments.
Absolutely! The routes are rich with points of interest. You can explore highlights like The tunnels of Véloroute 81 and the Vernajoul Viaduct Greenway, which are integral parts of some trails. Other notable features include the Col de la Crouzette (1245 m) and the scenic Foix–Saint-Girons Greenway, offering stunning views and historical context.
The komoot community highly rates the no-traffic gravel biking experience around Alzen, with an average score of 4.8 out of 5 stars from 23 ratings. Riders often praise the tranquility of the routes, the well-maintained greenways, and the opportunity to immerse themselves in nature away from vehicle noise.
While many routes in this guide are rated moderate to difficult, the greenways themselves often provide a smoother, more accessible surface. For instance, sections of the Vernajoul Viaduct Greenway – Viaduct with Scenic View loop from Saint-Martin-de-Caralp are moderate and offer a good starting point for those new to gravel biking, focusing on scenic views rather than extreme technical challenges.
Yes, several trails provide excellent opportunities for panoramic views. The Vernajoul Viaduct Greenway, for example, is specifically highlighted for its scenic vistas. Additionally, routes that ascend to higher elevations, such as those near the Col de la Crouzette (1245 m), will reward you with expansive outlooks over the surrounding landscape.
The region boasts several natural highlights. You can explore the broader Couserans region, known for its natural beauty. Specific natural features include the Cap du Carmil and the serene Lac de Mondély, offering peaceful spots to pause and enjoy the environment.
The Alzen region is generally enjoyable for gravel biking from spring through autumn, when the weather is mild and the natural scenery is at its most vibrant. While some trails might be accessible in winter, checking local conditions for snow or ice is always recommended, especially on higher elevation sections or shaded greenways.
Experienced riders seeking a challenge will find several difficult routes. The The tunnels of Véloroute 81 – Foix–Saint-Girons Greenway loop from Castelnau-Durban, at over 80 km with significant elevation gain, is a demanding option. Another challenging ride is the Col de la Crouzette (1245 m) – Old metal bridge loop from Cadarcet, which features substantial climbing and a longer duration.
While the guide focuses on the trails themselves, many of the starting points for these routes are located near towns or villages that may have public transport connections. It's advisable to check local bus or train schedules for towns like Castelnau-Durban, Saint-Martin-de-Caralp, or Ganac to plan your access to the trailheads.
Yes, the routes often pass near or through charming settlements. The town of Foix is a significant highlight, offering historical attractions and amenities. Exploring these towns can add a cultural dimension to your gravel biking adventure.


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