Chartreuse Regional Nature Park (Parc Naturel Régional de Chartreuse) straddles the Isère and Savoie départements over an area of 69,000 hectares. The scenery consists of mountains, forests, limestone cliffs, gorges and Alpine meadows, making it paradise for nature lovers. Numerous sporting activities are available there in summer, from walking along the many waymarked footpaths and climbing, to mountain biking and hang gliding. In winter, the family resort of Saint-Pierre-de-Chartreuse, in the Isère, offers cross-country and downhill skiing, and snowshoeing.
The Chartreuse mountains boast many natural sites worth visiting, in particular Charmant Som summit for its stunning panoramic viewpoint (Belvédère des Sangles), Guiers Mort gorges, Pas du Frou (a dizzyingly high road dominating a precipice), Saint-Même cirque and the quiet and peaceful setting of Grande Chartreuse monastery.
The Park Visitor Centre (Maison du Parc) in Saint-Pierre-de-Chartreuse has lots of useful information for organising your stay in the Chartreuse mountains.