3.9
(18)
109
riders
10
rides
Gravel biking around Alzen features a landscape shaped by historical transport infrastructure, including converted railway lines and greenways. The region offers varied terrain, from sections passing through old tunnels and over viaducts to paths alongside rivers and through rural areas. Elevation changes are present, providing both challenging climbs and more moderate sections suitable for different fitness levels.
Last updated: July 19, 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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5.0
(1)
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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Trailhoulet du Vernajoul 10.5 kms
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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.
2
0
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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There are over 10 gravel bike trails documented on komoot around Alzen, offering a variety of experiences for different skill levels. The region is known for its routes along historical transport infrastructure like converted railway lines and greenways.
While many routes in Alzen are moderate to difficult, there are options suitable for those looking for a less strenuous ride. For example, the Foix – Vernajoul Viaduct Greenway loop from Saint-Martin-de-Caralp is a moderate 20.7-mile (33.3 km) path that incorporates greenway sections, making it a good choice for beginners or families.
Gravel biking around Alzen is characterized by varied terrain, including sections through old tunnels, over viaducts, and along greenways. You'll also find paths alongside rivers and through rural areas, with elevation changes providing both challenging climbs and more moderate sections.
Yes, advanced riders can tackle longer and more challenging routes. The The tunnels of Véloroute 81 – Foix–Saint-Girons Greenway loop from Castelnau-Durban is a difficult 50.1-mile (80.7 km) trail that explores extensive sections of the Véloroute 81, including its tunnels and greenway paths, offering a significant challenge.
The komoot community highly rates the gravel biking experience in Alzen, with an average score of 4.8 stars. Reviewers often praise the unique historical infrastructure, such as the old railway lines, tunnels, and viaducts, which provide a distinctive backdrop for rides. The varied terrain and well-maintained greenways are also frequently highlighted.
Many of the gravel routes in Alzen are designed as loops, allowing you to start and end at the same point. Examples include the Foix – Vernajoul Viaduct Greenway loop from Saint-Martin-de-Caralp and The tunnels of Véloroute 81 – Old Rimont Station loop from Castelnau-Durban, which offer convenient circular options.
The region's climate generally allows for gravel biking through much of the year. Spring and autumn often provide pleasant temperatures and beautiful scenery. Summer can be warm, making early morning or late afternoon rides ideal. Winter riding is possible, but check local conditions for ice or snow, especially in shaded tunnel sections.
Many routes in Alzen, particularly those that incorporate viaducts or elevated sections of old railway lines, offer scenic views of the surrounding rural landscape and river valleys. The greenway sections often provide open vistas, and the historical infrastructure itself is a point of interest.
While specific cafes directly on every trail are not guaranteed, routes that pass through or near towns and villages like Castelnau-Durban or Saint-Martin-de-Caralp will likely have opportunities for refreshments. Planning your route with komoot allows you to identify potential stops along the way.
For routes starting from towns like Castelnau-Durban or Saint-Martin-de-Caralp, you can typically find public parking facilities. It's advisable to check local parking regulations and availability in these starting points before your ride.
Access to trailheads via public transport can vary. While some larger towns in the wider region may have train or bus connections, direct public transport links to specific, more remote trail starting points might be limited. It's recommended to research local bus services or train connections to the nearest towns and plan accordingly.
While the main routes like those along the Véloroute 81 are popular, the extensive network of greenways and rural paths means there are always quieter sections to explore. Look for routes that venture further into the countryside away from the main historical infrastructure for a more secluded experience, such as the Old metal bridge – Vernajoul Viaduct Greenway loop from Sentenac-de-Sérou.


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