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Montjay Tunnel – Fauvettes Viaduct loop from Orsay-Ville

Montjay Tunnel – Fauvettes Viaduct loop from Orsay-Ville

Hard

4.3

(4)

riders

Montjay Tunnel – Fauvettes Viaduct loop from Orsay-Ville

01:47

30.1km

230m

Gravel riding

Hard gravel ride. Good fitness required. You may need to push your bike for some segments of this route. The starting point of the route is accessible with public transport.

Last updated: November 26, 2025

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Tips

Includes a segment that is highly dangerous

A part of this route comprises highly technical, difficult, or hazardous terrain. Specialist equipment and prior experience is required.

After 18.1 km for 75 m

Waypoints

Start point

Train Station

Get Directions

3.21 km

Montjay Tunnel

Highlight • Trail

Like the nearby Fauvettes viaduct, the Montjay tunnel once served as the old Paris-Chartres railway line. In the middle of the communal forest of Bures-sur-Yvette, it punctuates the straight and rolling line leading to the viaduct.

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3.83 km

Fauvettes Viaduct

Highlight • Bridge

Magnificent viewpoint over the valley surrounded by greenery, accessible by "gravel" paths (roots and stones) through the wood or by "hiking / mountain biking" trails in the valley (it will …

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7.19 km

The Original Test Track of Aérotrain

Highlight • Other

it's 4km in a straight line along this old train track of Aerotrain

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18.1 km

Stone Arch Bridge on the Old Railway Line

Highlight • Bridge

Super atypical passage, I recommend

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24.4 km

Bassin de Coupières

Highlight • Natural

Created to retain the floods of the Yvette, the Bassin de Coupières offers a beautiful unobstructed view of the Bois d'Aigrefoin. Walking along its abundant vegetation is extremely pleasant.

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27.3 km

Chemin du Bras Mort in Bures-sur-Yvette

Highlight • Cycleway

The Chemin du Bras Mort cycle path in Bures-sur-Yvette offers a serene and picturesque ride through the natural beauty of the Chevreuse Valley. Following the meanders of the Yvette, this …

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28.1 km

Grande Maison Park

Highlight • Natural

This park owes its name to the bourgeois-style building present in the middle of its seven hectares of greenery. It is pleasant to run on its wide paths and along …

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30.1 km

End point

Train Station

Way Types & Surfaces

Way Types

10.0 km

9.66 km

5.12 km

2.73 km

2.56 km

< 100 m

Surfaces

14.5 km

8.90 km

6.01 km

452 m

268 m

Elevation

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

Highest point (180 m)

Lowest point (60 m)

Weather

Thursday 12 March

12°C

4°C

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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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Montjay Tunnel – Fauvettes Viaduct loop from Orsay-Ville

Montjay Tunnel

Fauvettes Viaduct

The Original Test Track of Aérotrain

Stone Arch Bridge on the Old Railway Line

Bassin de Coupières

Chemin du Bras Mort in Bures-sur-Yvette

Grande Maison Park

Nearby routes

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