La Chaussée Jules César et la vallée de la Viosne

De la chaussée Jules César se dégagent de beaux panoramas sur les communes de Boissy-l'Aillerie, Courcelles et Montgeroult, au cœur de la vallée de la Viosne.

Covering 11.8 km, this is a substantial hike requiring a reasonable base fitness. Most walkers complete it in about 2 hours and 38 minutes.

This loop trail is a practical choice for day hikers: you start and end at the same spot, with no shuttle or pick-up required. The trail is officially waymarked as JC5, so look out for the trail markers along the way.

This is a Local Walking Network (LWN) trail — a community-level route perfect for exploring the immediate surroundings, popular with locals and visitors alike.