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Single from Port-Royal – Vaux‑en‑Cernay Lake loop from Gif-sur-Yvette

Routes

Mountain biking trails

Single from Port-Royal – Vaux‑en‑Cernay Lake loop from Gif-sur-Yvette

Hard

4.7

(3)

riders

Single from Port-Royal – Vaux‑en‑Cernay Lake loop from Gif-sur-Yvette

04:40

55.2km

680m

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: May 12, 2026

Tips

Includes segments that are highly dangerous

Parts of this route comprise highly technical, difficult, or hazardous terrain. Specialist equipment and prior experience is required.

After 46.1 km for 5 m

After 46.8 km for 75 m

Waypoints

Start point

Train Station

Get Directions

2.84 km

Vallée de la Mérantaise

Highlight • Gorge

The Mérantaise Valley, near Villiers-le-Bâcle, is a veritable green haven in Île-de-France. The trail runs along the Mérantaise River, winding through dense forests, meadows and wetlands rich in biodiversity. It …

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6.61 km

Forêt domaniale de Port Royal

Forest

10.3 km

La Mérantaise and its washhouse

Highlight • Historical Site

The forest of Port-Royal is distinguished by the pretty landscapes created by the Mérantaise which crosses it. The washhouse set up by the river further embellishes this idyllic setting.

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13.9 km

Bois de la Garenne

Forest

17.8 km

Single from Port-Royal

Highlight • Other

Long single of 5km a little technical and while relaunching !!
Great !
Avoid in too wet weather there are a lot of roots that slip and the formation of …

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28.7 km

Maincourt Washhouse

Highlight • Monument

Nestled in the Chevreusee Valley, the Maincourt-sur-Yvette washhouse is a beautiful piece of rural heritage. This stone washhouse, carefully restored, is surrounded by greenery. A little gem to discover during a stroll in the region.

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35.9 km

Vaux‑en‑Cernay Lake

Highlight • Lake

Breathtaking view of the pond
ideal for a picnic

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36.3 km

Petit Moulin des Vaux de Cernay

Highlight • Structure

A former mill on the road

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37.0 km

Réserve biologique dirigée du Bois Boisseau

Nature Reserve

43.7 km

Méridon Castle

Highlight • Castle

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

Tip by

46.8 km

Stone Arch Bridge on the Old Railway Line

Highlight • Bridge

Super atypical passage, I recommend

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48.7 km

Réserve naturelle du val et coteau de Saint-Rémy

Nature Reserve

55.2 km

End point

Train Station

Way Types & Surfaces

Way Types

30.0 km

16.0 km

3.16 km

3.06 km

2.35 km

540 m

< 100 m

Surfaces

23.1 km

12.5 km

9.65 km

8.35 km

796 m

422 m

259 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

Tuesday 14 July

32°C

22°C

18 %

Additional weather tips

Max wind speed: 19.0 km/h

to get more detailed weather forecasts along your route

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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Single from Port-Royal – Vaux‑en‑Cernay Lake loop from Gif-sur-Yvette

Vallée de la Mérantaise

La Mérantaise and its washhouse

Single from Port-Royal

Maincourt Washhouse

Vaux‑en‑Cernay Lake

Petit Moulin des Vaux de Cernay

Méridon Castle

Stone Arch Bridge on the Old Railway Line

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