Gorges du Frou and the following Gorges de l'Echaillon are located near the village of Saint-Christophe-sur-Guiers on Chartreuse Natural Regional Park in Isère department of France. The two gorges is situated close togheter and it is separated by a short and pleasant walk along Guiers Vif river. The upper and lower section of the gorges requires 800 meters of swim on a cold water on a deep and dark area. A small rope can be useful on some section. Canyon covered by Alex Oulevey and the author in summer 2000.