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Routes
Mountain biking trails
France
Ile-de-France
Palaiseau
Orsay

Montjay Tunnel – Méridon Castle loop from Orsay-Ville

Routes
Mountain biking trails
France
Ile-de-France
Palaiseau
Orsay

Montjay Tunnel – Méridon Castle loop from Orsay-Ville

Hard

5.0

(1)

29

riders

Montjay Tunnel – Méridon Castle loop from Orsay-Ville

03:21

44.2km

560m

Mountain biking

Hard mountain bike ride. Good fitness required. Advanced riding skills necessary. Some portions of the route may require you to push your bike. The starting point of the route is accessible with public transport.

Last updated: June 20, 2026

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 15.1 km for 29 m

Waypoints

A

Start point

Train Station

Get Directions

1

2.13 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 …

Translated by Google •

Tip by

2

3.87 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

7.47 km

Forêt communale de Gif-sur-Yvette

Forest

13.3 km

Réserve naturelle du val et coteau de Saint-Rémy

Nature Reserve

5

15.1 km

Super atypical passage, I recommend

Translated by Google •

Tip by

6

15.4 km

Single VTT in the Nauroy woods

Highlight (Segment) • Trail

Very small detour to avoid a very steep single S5.

Translated by Google •

Tip by

7

16.6 km

Along the fields

Highlight • Other

takes us to picnic tables

Translated by Google •

Tip by

8

19.6 km

Méridon Castle

Highlight • Castle

You can’t visit it, it is private.
Nice position in the forest.

Tip by

9

21.7 km

Bottom of the single

Highlight • Trail

single technique

Tip by

10

22.4 km

Single along the Dampierre estate

Highlight (Segment) • Trail

Single/piste to be preferred in an easterly direction, so as not to suffer too much from the stones on the slope. A few branches across the path, fortunately not impassable (August 2022).

Translated by Google •

Tip by

B

44.2 km

End point

Train Station

Loading

Way Types & Surfaces

Way Types

18.4 km

7.71 km

7.01 km

5.90 km

4.79 km

356 m

109 m

Surfaces

17.7 km

11.3 km

8.67 km

3.62 km

2.53 km

226 m

160 m

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Elevation

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)

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Weather

Powered by Foreca

Saturday 11 July

35°C

22°C

0 %

Additional weather tips

Max wind speed: 21.0 km/h

to get more detailed weather forecasts along your route

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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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