Entre Grignon et Monthion

Jolie boucle en balcon pour relier les deux villages. Si l'on est en forme, on peut faire le tour jusqu'à l'observatoire pour prendre davantage de hauteur.

This 7.8 km route sits in the sweet spot for a half-day outing — long enough to feel rewarding, short enough to leave the afternoon free. Expect around 1 hour and 44 minutes.

The route nearly completes a loop, with start and end points within easy walking distance of each other. Minimal logistics required.

Part of the Local Walking Network (LWN), this trail is ideal for exploring the neighbourhood landscape. It is typically well-known to local walkers and offers an authentic sense of place.