The source of the Doubs River is a powerful karst spring in a heavily karstified area of the Jura Mountains. It lies at an altitude of 937 meters at the …
Several million years ago, the Ain was lost underground, in a labyrinth of cavities, an underground gallery called "losses". Over time, the work of water erosion has done its work, …
Nicknamed "Little Siberia", Mouthe is known for its freezing winter temperatures. It is also here that the Doubs river has its source. Located at the gates of the Jura Natural …
The Serpentine, (first tributary of the Ain river whose source is located a little higher) forms a small lake near the ruins of a mill. It is from a cornice …