In the Chevreuse Valley
Walker 
19.24 km
+334 m
-341 m
6h 25
Difficult
Departure from Chevreuse (Yvelines)
A beautiful hike to discover the beautiful sights of the Chevreuse valley: the Chatillonmill, the castle of Dampierre, the blacksmith’s, the villages of Fourcherolles, Senlisse and Choisel, Méridon castle, the village of Chevreuse and its small bridges along the Yvette, and Château de la Madeleine.
The Viaduc des Fauvettes and the Forêt de Gif-sur-Yvette
Walker 
10.55 km
+217 m
-226 m
3h 40
Moderate
Departure from Bures-sur-Yvette (Essonne)
A walk of many faces! On forest tracks interspersed with paths through the city, you follow an old railway line with a tunnel and viaduct, finishing along the course of the river Yvette. A walk to enjoy at any time of year.
The Roselière (reed beds) of Maincourt
Walker 
9.08 km
+59 m
-67 m
2h 45
Moderate
Departure from Lévis-Saint-Nom (Yvelines)
At the heart of the Chevreuse Valley Natural Park, a hike that allows you to wander through a protected natural site with a trail laid out by the Park. In the Bois de Maincourt, one can see ancient sandstone quarries. The course of the river Yvette, which the trail follows on the way back, finally allows a patrimonial approach with old mills and old washhouses.