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Viaduc de la Chaise – Nonières Tunnel loop from Bosas

Routes

Mountain biking trails

Viaduc de la Chaise – Nonières Tunnel loop from Bosas

Hard

4.4

(5)

riders

Viaduc de la Chaise – Nonières Tunnel loop from Bosas

05:25

65.6km

1,300m

Mountain biking

Hard mountain bike ride. Very good fitness required. Suitable for all skill levels. The starting point of the route is accessible with public transport.

Last updated: May 12, 2026

Tips

Your route passes through protected areas

Please check local regulations for:

Parc naturel régional des Monts d'Ardèche

Waypoints

Start point

Bus stop

Get Directions

17.5 km

Tunnel de la Molle

Highlight • Other

19.0 km

Bridge of Misfortune

Highlight • Other

On September 8, 1902, during the construction of the "Bon Pas" viaduct, nine workers were killed when the keystone collapsed. This viaduct, a work on the CFD La Voulte-sur-Rhône–Saint-Agrève line …

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19.2 km

Asseyne Tunnel

Highlight • Structure

25.5 km

DOLCE VIA 10KM short circuit

Highlight • Other

ideal to do in force, if you have little time, or on a stroll for nice views and picturesque panoramas.

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30.1 km

Iron Bridge of Saint-Martin-de-Valamas

Highlight • Bridge

In Saint-Martin-de-Valamas, there is this iron bridge typical of the Eiffel style, popularized at the turn of the 20th century. It is recognized by the metal beams and the X-shaped structure.

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31.7 km

View of the Eyrieux Gorges

Highlight • Viewpoint

Impressive view into the gorge

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40.0 km

Viaduc de la Chaise

Highlight • Bridge

44.7 km

Nonières Tunnel

Highlight • Cycleway

The great thing about old railway tunnels on a cycle route: They often save you a tedious road over a pass. Although you sometimes lose a bit of a good …

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61.5 km

Château de Désaignes

Castle

65.6 km

End point

Bus stop

Way Types & Surfaces

Way Types

31.0 km

11.4 km

10.9 km

7.80 km

2.75 km

1.67 km

< 100 m

Surfaces

28.8 km

17.9 km

8.58 km

7.47 km

1.53 km

1.24 km

Elevation

Nothing selected – click and drag below to see the stats for a specific part of the route.

Highest point (1,060 m)

Lowest point (390 m)

Weather

Thursday 25 June

33°C

17°C

-- %

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Comments

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Our route recommendations are based on thousands of hikes, rides, and runs completed by other people on komoot.

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Viaduc de la Chaise – Nonières Tunnel loop from Bosas

Tunnel de la Molle

Bridge of Misfortune

Asseyne Tunnel

DOLCE VIA 10KM short circuit

Iron Bridge of Saint-Martin-de-Valamas

View of the Eyrieux Gorges

Viaduc de la Chaise

Nonières Tunnel

Nearby routes

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