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Montjay Tunnel – Fauvettes Viaduct loop from Les Ulis

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Bike touring routes & trails

Montjay Tunnel – Fauvettes Viaduct loop from Les Ulis

Moderate

riders

Montjay Tunnel – Fauvettes Viaduct loop from Les Ulis

02:15

28.8km

400m

Cycling

Moderate bike ride. Good fitness required. Mostly paved surfaces. Suitable for all skill levels. The starting point of the route is accessible with public transport.

Last updated: May 16, 2026

Tips

Cycling is not permitted along parts of this route

After 14.2 km for 89 m

After 14.8 km for 293 m

After 15.3 km for 55 m

Waypoints

Start point

Bus stop

Get Directions

1.72 km

The trail entrance to se the tunnel in here on the right

Highlight • Other

Be careful not to continue straight uphill and miss the trailhead. On this trail, you go right into it and then turn left on a wide path, a few meters away you can already see the tunnel.

Tip by

3.99 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.

Translated by Google •

Tip by

4.58 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 …

Translated by Google •

Tip by

13.0 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.

Translated by Google •

Tip by

14.3 km

Saint-Rémi Church of Gif-sur-Yvette

Highlight • Religious Site

beautiful church often open and allows you to sit in the cool of summer during the heatwave

Translated by Google •

Tip by

14.6 km

La mérantaise and its washhouse

Highlight • Other

Bucolic place but more for pedestrians than cyclists

Translated by Google •

Tip by

17.6 km

Single descents

Highlight • Other

25.4 km

A beautiful, safe climb

Highlight (Segment) • Other

Difficult to do better to climb on the plateau of Ulis from the bottom of Orsay: dedicated cycle path, spans the D188 and remains above the N118, regular slope (although sustained).

Translated by Google •

Tip by

28.8 km

End point

Bus stop

Way Types & Surfaces

Way Types

7.22 km

6.01 km

5.75 km

5.05 km

4.27 km

307 m

157 m

Surfaces

13.4 km

8.43 km

3.57 km

2.35 km

880 m

126 m

Elevation

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

Highest point (170 m)

Lowest point (60 m)

Weather

Monday 25 May

31°C

15°C

0 %

Additional weather tips

Max wind speed: 9.0 km/h

to get more detailed weather forecasts along your route

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 Les Ulis

The trail entrance to se the tunnel in here on the right

Montjay Tunnel

Fauvettes Viaduct

Bassin de Coupières

Saint-Rémi Church of Gif-sur-Yvette

La mérantaise and its washhouse

Single descents

A beautiful, safe climb

Nearby routes

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