This route in the Chartreuse regional nature park abounds with natural treasures such as the Cirque de Saint-Même and some of Isère's cultural treasures including the Grande Chartreuse museum.

Start in Saint-Étienne-de-Crossey. Take the D49 towards Saint-Nicolas-de-Macherin. Just after Le Pilon, turn right and continue until you reach Sainte-Sixte.
Pass by Le Burlet and continue on the D28 to Miribel-les-Échelles.
Continue on the D49, pass through Les Échelles, Saint-Christophe-sur-Guiers then cycle along the Gorges du Guiers Vif to Saint-Pierre-d'Entremont.
Turn right towards Saint-Pierre-de-Chartreuse via Le Planolet.
Turn right towards Saint-Laurent-du-Pont (D520B) then head for Villette and Basbolin.
Take the D49 and turn left towards Saint-Roche. Return to the starting point via Ture.

This visit to the land of Carthusian monks abounds with monumental, preserved nature...emerald green forests, raging torrents and sharp cliffs.