Grotte d'Osselle

About

The cave of Osselle is a cave of a length of 8 kilometers, located near Osselle, 25 km from Besançon, with a part in the Doubs and another in the Jura in Franche-Comté. The entrance is located on the edge of the Doubs on the town of Roset-Fluans and the cave develops towards the southwest and reaches the town of Courtefontaine.