Circuit of the underground river 2 km long, accessible by the well of Chiloup in La Chapelle Bâton with abseiling of 18m and exit at the Lavoir de la Roche in ST-CHRISTOPHE-SUR-ROC. It was discovered in 1975. This river is located in a triangle : ST-CHRISTOPHE-SUR-ROC/LA CHAPELLE BATON/SAINT PROJET and is fed, on the one hand, by rainwater infiltrating the limestone layers and, on the other hand, by runoff water flowing into the chasms. Swimsuit and sport shoes + a change of clothes. Please contact Charlie from Emergence-Spéléo to book your trip.