4.4
(122)
761
riders
110
rides
Mountain biking around Sonthonnax-La-Montagne offers diverse terrain across a rolling plateau, river valleys, and higher elevations in the Ain department. The area features a mix of relatively flat sections and more challenging ascents and descents, with the highest point reaching 786 meters on the Chougeat plateau. Riders can explore dense woodlands, open plateaus, and riverbanks along the Ain River and the tranquil Lac de l'Oignin. This varied topography provides a natural playground suitable for different skill levels of mountain bikers.
…Last updated: July 11, 2026
5.0
(4)
19
riders
33.0km
02:59
630m
630m
Moderate mountain bike ride. Good fitness required. Advanced riding skills necessary.
5.0
(1)
34
riders
46.0km
04:25
1,010m
1,010m
Hard mountain bike ride. Very good fitness required. Suitable for all skill levels.

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4.7
(3)
19
riders
45.8km
02:49
490m
490m
Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.
5.0
(1)
16
riders
26.0km
02:18
510m
510m
Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.
4.5
(2)
9
riders
22.2km
01:27
280m
280m
Easy mountain bike ride. Great for any fitness level. Suitable for all skill levels.
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An impressive work that has its Wikipedia page https://fr.wikipedia.org/wiki/Viaduc_de_Cize-Bolozon
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This superb wild natural site overlooks the river d’Ain. Lined with spectacular cliffs, it offers remarkable panoramas from its trails and viewpoints.
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Nestled in a spectacular natural setting, the viaduct offers superb viewpoints over the Ain gorges. Built at the beginning of the 20th century and then rebuilt after the Second World War in 1950, it illustrates the railway and road heritage of the territory.
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pretty little stone viaduct with 2 superimposed lanes, one for cars with 6 arches and one for the train with 11 arches. Atypical.
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Beautiful paved road, but for those who prefer dirt tracks, cross to the other side of the river! There won't be any cars and the views are even more beautiful.
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Pretty little viaduct which is a real must-see!
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Magnificent viaduct, nice spot for an outing in Ain.
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Definitely worth a visit, you simply have to include this double-decker bridge in your itinerary.
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There are over 100 mountain bike trails around Sonthonnax-La-Montagne, offering a wide variety of options for different skill levels. You'll find everything from easy, rolling paths to more challenging routes with significant elevation gain.
Yes, Sonthonnax-La-Montagne offers several easy mountain bike trails. For a pleasant ride, consider the Cize-Bolozon Viaduct – Cize-Bolozon Viaduct loop from Cize, which is 13.8 miles (22.2 km) long and features gentle terrain. The region's varied plateau and riverbanks provide accessible routes for those new to mountain biking or looking for a relaxed outing.
The mountain bike trails around Sonthonnax-La-Montagne traverse diverse landscapes, including rolling plateaus, dense woodlands, and scenic river valleys. You'll encounter dramatic views along the Ain River and its gorges, tranquil sections near the Lac de l'Oignin, and picturesque villages like Heyriat and Napt. The terrain ranges from relatively flat sections to more challenging ascents and descents, offering a rich natural playground.
Absolutely. For experienced mountain bikers seeking a challenge, the region offers difficult routes with substantial elevation changes. A notable option is the Cize-Bolozon Viaduct – Cize-Bolozon Viaduct loop from Cize - Bolozon, a demanding 28.7 miles (46.1 km) path with over 1000 meters of ascent, providing expansive views and technical sections.
Many mountain bike routes pass by or near interesting landmarks. You can cycle past the impressive Cize-Bolozon Viaduct, explore the natural beauty of Lake Nantua, or discover the intriguing Grotte de Corveissiat. Other attractions include the historic Oliferne Castle Ruins and the serene Chartreuse de Sélignac.
Yes, the region is rich in water features. You can find trails that lead to natural cascades, such as the Cascade de la Pisse Vache. The Oignin river and its gorges also offer scenic routes with opportunities to see water features.
The mountain bike trails around Sonthonnax-La-Montagne are highly rated by the komoot community, with an average score of 4.5 stars from over 100 reviews. Riders often praise the varied terrain, the mix of rolling and technical sections, and the beautiful natural scenery, especially along the river valleys and plateaus.
Yes, there are several longer mountain bike routes for those looking for extended rides. For example, the Lac de Coiselet – Corveissiat Cave loop from Thoirette covers 28.5 miles (45.8 km) and takes you through varied landscapes including the Lac de Coiselet. Another option is the Along Lake Coiselet loop from Matafelon-Granges, which is 20 miles (32.1 km) long.
Absolutely. The region features beautiful lakes that are integrated into some mountain bike routes. You can enjoy rides around the tranquil Lake Nantua and the Lac de l'Oignin, with trails often running alongside their shores, providing pleasant waterside exploration.
The diverse topography of Sonthonnax-La-Montagne makes it suitable for mountain biking across multiple seasons. Spring and autumn offer pleasant temperatures and vibrant scenery, while summer provides longer daylight hours. Even in winter, some trails may be accessible, though conditions can vary, especially at higher elevations.
Yes, many of the mountain bike trails in Sonthonnax-La-Montagne are designed as loops, allowing you to start and finish at the same point. For instance, the popular Corveissiat Cave – Cize-Bolozon Viaduct loop from Cize is a 20.2 miles (32.5 km) circular route that offers scenic views.


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