Best attractions and places to see around Castelnau-Durban include a variety of natural and man-made features. The region offers extensive greenways, including those that repurpose old railway lines, providing routes through varied terrain. Mountain passes are also present, offering elevated perspectives. The landscape is characterized by opportunities for cycling and exploring historical routes.
Last updated: July 7, 2026
Highlight (Segment) • Cycleway
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Highlight (Segment) • Mountain Pass
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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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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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The greenway from St-Giron to Foix (which I always did in the direction Foix to St-Giron) is the most beautiful part of the greenway which in total goes to (almost) Boussens. It is a slightly hilly section with the most beautiful landscapes!
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This is the longest tunnel on the greenway: it's super fun to go through. Be careful: it's a bit chilly!
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Hello everyone, I'm from Ariège, I decided this year to do the greenway with my dog Emy in both directions. It's a very beautiful walk, however there are some black points: lack of stone benches to deter potential thieves, and on the other hand the large Rimont tunnel which is 803 m long there is no more light. The motion detector does not work. Luckily that day I had my flashlight with me. There is horse excrement everywhere, perhaps one day we will have to ask the riders to pick up their droppings. It's a very beautiful walk.
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The Col de la Crouzette, rising to 1,244 m but sometimes indicated at 1,241 or 1,245 m, is a road pass in the Pyrenees in the department of Ariège, to the south the commune of Biert, on the limit with Rivèrenert , on the route des cimes between Saint-Girons and Foix. Wikipedia
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The region offers several distinctive natural features. You can explore the fascinating Grotte du Mas-d'Azil, a prehistoric cave uniquely crossed by both the Arize river and a road. For elevated perspectives, the Col de la Crouzette (1245 m) provides a less frequented mountain pass with scenic views.
Yes, the area is well-suited for families. The Foix–Saint-Girons Greenway and the V81 Greenway Tunnels (Saint-Girons – Foix) are both excellent choices for accessible walks or bike rides, following old railway lines. The Grotte du Mas-d'Azil also offers an educational and intriguing experience for all ages.
Castelnau-Durban is known for its greenways and mountain passes, perfect for cycling. The Tunnels of Véloroute 81 offer a unique 44-kilometre greenway with motion-detector equipped tunnels between Saint-Girons and Foix. You can also tackle the Col de la Crouzette (1245 m) for a more challenging road cycling climb. For more routes, check out the cycling guide for Castelnau-Durban.
The Grotte du Mas-d'Azil is a significant historical site, famous for its prehistoric portable art and a museum dedicated to the Upper Palaeolithic period. The greenways themselves, like the Foix–Saint-Girons Greenway, follow old railway lines, offering a glimpse into the region's industrial past.
The region provides various hiking opportunities, often utilizing the scenic greenways. For moderate hikes, consider routes like the 'Monserons Hills loop from Castelnau-Durban' or the 'Drinking Water Tap loop from La Bastide-de-Sérou'. You can find more detailed hiking routes and options in the hiking guide for Castelnau-Durban.
Absolutely. The Col de la Crouzette (1245 m) is a mountain pass renowned for its elevated perspectives and quiet, narrow roads. The Foix–Saint-Girons Greenway is also described as very scenic, offering pleasant views along its path.
Visitors frequently appreciate the unique experience of the greenways, especially the illuminated tunnels of Véloroute 81. The accessibility and scenic nature of routes like the Foix–Saint-Girons Greenway are also highly valued for family outings. The historical and natural wonder of the Grotte du Mas-d'Azil also leaves a lasting impression.
The greenways, such as the Foix–Saint-Girons Greenway, are generally accessible as they follow old rail lines, providing relatively flat paths. However, some sections may have uneven surfaces, so it's advisable to check specific conditions or visitor tips for the most up-to-date information.
While popular, the Col de la Crouzette (1245 m) is noted as a less known and attractive mountain pass, offering a quieter route away from more frequented areas. Exploring the various sections of the greenways can also reveal peaceful, shaded stretches, particularly between Saint-Girons and Foix.
The tunnels on Véloroute 81 are equipped with motion detectors that illuminate as you pass through, creating a unique experience. While they are lit, having your own light, especially on a bike, can be helpful. Be aware that the surface inside the tunnels and on some parts of the greenway can be uneven.
When visiting the Grotte du Mas-d'Azil, be prepared for some dark sections, so a good lamp is mandatory. The pavement on the side can be treacherous. There is also a museum inside the cave where you can learn more about its prehistoric significance.


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