Head out to explore the landscapes of the French Vexin through a series of geological walks held across the region on October 3, 4 and 11, 2026, as part of the new edition of the Science Festival.
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.
