The Val-d'Oise département is home to the Parc Naturel du Vexin, a protected green space and a gem of a hiking area. We invite you to cross it on the Vexin Express.
Discover the landscapes of the French Vexin through various geological walks organized throughout the region on October 4, 11 and 12, 2025, to mark the new Fête de la Science.
