4.2
(236)
1,478
riders
77
rides
Mountain biking around Fos-Sur-Mer offers diverse natural landscapes and an extensive network of routes. The region is characterized by a mix of natural reserves, including the Réserve Naturelle des Coussouls de Crau and the Parc Naturel Régional de Camargue, providing varied ecosystems. Trails feature both paved and unpaved surfaces, with some sections requiring good fitness due to elevation changes. The area also includes the Forest of Castillon and picturesque routes around bodies of water like the Engrenier Pond.
Last updated: June 24, 2026
4.3
(7)
72
riders
45.5km
03:37
420m
420m
Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.
3.6
(7)
69
riders
42.3km
03:07
470m
470m
Moderate mountain bike ride. Good fitness required. Advanced riding skills necessary.

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4.4
(14)
67
riders
24.6km
02:02
270m
270m
Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.
4.0
(23)
112
riders
37.0km
03:01
520m
520m
Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.
4.8
(5)
55
riders
39.5km
03:14
420m
420m
Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.
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Passes very high up but very nice to take!
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Excellent parking to enjoy the many starting points for walks
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The town of Istres, located on the Étang de Berre lake, has a well-preserved and lively town center, with shops, alleys, and squares in a medieval atmosphere. The Étang de Berre lake, the Côte Bleue, the Camargue, and the Crau plain offer numerous hiking trails and excellent cycling routes.
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Beautiful 360° viewpoint, from above
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There are over 75 mountain bike trails around Fos-Sur-Mer, offering a wide range of options for different skill levels and preferences.
Yes, Fos-Sur-Mer offers a good selection of trails for beginners. You'll find over 35 easy routes, such as the Water tower loop from Fos-sur-Mer, which is 5.2 miles (8.5 km) long and takes about 39 minutes to complete with minimal elevation gain.
The terrain around Fos-Sur-Mer is quite varied, featuring a mix of paved and unpaved surfaces. You can expect routes through natural reserves like the Réserve Naturelle des Coussouls de Crau, the Forest of Castillon, and picturesque paths around bodies of water such as the Engrenier Pond. Some sections can be challenging with notable elevation changes, requiring good fitness.
Yes, many of the mountain bike trails in Fos-Sur-Mer are circular. For example, the Saint Blaise - Castillon – Saint Blaise Chapel loop from Chemin du Chaland is a moderate 16.5-mile (26.6 km) route that forms a loop, offering a mix of natural landscapes and historical sites.
Many routes offer scenic views, including Mediterranean vegetation and coastal panoramas. You can also cycle near various ponds like the Engrenier Pond and the Pourra Pond. Historical sites such as the Oppidum of Saint-Blaise and the Rock tombs in the Castillon forest are also accessible along some routes.
While specific rules for dogs on mountain bike trails can vary, generally, dogs are welcome in many natural areas around Fos-Sur-Mer, especially in the larger natural reserves. It's always advisable to keep them on a leash and ensure they are well-behaved, particularly when encountering other trail users or wildlife. Check local signage for any specific restrictions.
Absolutely. With over 35 easy trails, there are plenty of options suitable for families. These routes typically have less elevation gain and are shorter in distance, making them enjoyable for riders of all ages. The varied landscapes, including routes near ponds and through forests, provide engaging scenery for family outings.
The region's Mediterranean climate makes mountain biking enjoyable for much of the year. Spring and autumn generally offer the most pleasant temperatures, avoiding the intense heat of summer and potential cooler, wetter conditions in winter. However, with proper preparation, trails can be ridden year-round.
Yes, experienced riders will find challenging options. Some routes feature significant elevation gain and unpaved, difficult sections that require good fitness and advanced riding skills. For example, the Saint Blaise Chapel – Saint Blaise - Castillon loop from Fos-sur-Mer is a moderate 18.7-mile (30.2 km) path with notable elevation gain, providing a more demanding experience.
The mountain bike trails around Fos-Sur-Mer are highly rated by the komoot community, with an average score of 4.0 stars from over 280 reviews. Riders often praise the diverse natural landscapes, the extensive network of routes catering to different skill levels, and the scenic views, including coastal access and routes through the Forest of Castillon.
Yes, there are several longer routes for those looking for extended rides. The Martigues Canal – St blaise loop from Fos-sur-Mer is a moderate 28.8-mile (46.4 km) trail, offering a substantial ride with varied terrain and elevation.
Many trailheads in and around Fos-Sur-Mer offer accessible parking. Given the region's focus on outdoor activities, you'll typically find designated parking areas near popular starting points for trails, especially those leading into natural reserves or forests like Castillon. It's always a good idea to check the specific tour details on komoot for parking information related to your chosen route.


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