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Janvry Fountain – Fauvettes Viaduct loop from Briis-sous-Forges

Janvry Fountain – Fauvettes Viaduct loop from Briis-sous-Forges

Hard

riders

Janvry Fountain – Fauvettes Viaduct loop from Briis-sous-Forges

02:45

43.7km

500m

Gravel riding

Hard gravel ride. Very 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: May 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 28.8 km for 75 m

Waypoints

Start point

Bus stop

Get Directions

3.71 km

Janvry Fountain

Highlight • Castle

Nice little village to see

Translated by Google •

Tip by

3.87 km

Janvry Castle

Highlight • Castle

Private castle; a pretty alley leads there.

Translated by Google •

Tip by

9.53 km

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 however be necessary to ascend the elevation on foot in this case).
Built in 1913 for the "Paris-Chartres" line, bombed in 1944, unused, closed, the viaduct was recently renovated for leisure. We see caving groups training there, as well as climbers who practice climbing on the pillars.

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10.1 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 •

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21.6 km

Côte de Chateaufort

Highlight (Segment) • Other

Very nice climb, to do without hesitation. A Jacques Anquetil memorial is located at the top of the hill, to the left of the red lights.

Translated by Google •

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28.8 km

Stone Arch Bridge on the Old Railway Line

Highlight • Bridge

Super atypical passage, I recommend

Translated by Google •

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29.9 km

Tour in the woods...

Highlight • Other

30.5 km

Boullay-les-Troux Climb

Highlight • Climb

Nice climb in the shade, little traffic, medium tar if very thin tire (<25 mm)

Translated by Google •

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43.7 km

End point

Bus stop

Way Types & Surfaces

Way Types

14.0 km

13.0 km

6.22 km

5.50 km

4.82 km

164 m

Surfaces

21.3 km

10.1 km

8.19 km

3.56 km

291 m

271 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

Today

Friday 22 May

29°C

14°C

0 %

Additional weather tips

Max wind speed: 8.0 km/h

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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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Janvry Fountain – Fauvettes Viaduct loop from Briis-sous-Forges

Janvry Fountain

Janvry Castle

Fauvettes Viaduct

Montjay Tunnel

Côte de Chateaufort

Stone Arch Bridge on the Old Railway Line

Tour in the woods...

Boullay-les-Troux Climb

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