La source du Doubs

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 foot of the forested, up to 1,419-meter-high Mont Risoux mountain range, which straddles the border between France and Switzerland. The Doubs River rises from a small, approximately five-meter-deep spring basin in a cave in the rock.

The source of the Doubs is actually an underground outflow of the Swiss Lac du Joux, located beyond the ridge. On its way in the mountain, the water flows through a deep siphon, i.e. a deeper cavity, before it rises again and emerges here as a small river. All around, too, the water gushes out of the slope, trickles out of the ground, a real kingdom of water.

Only a few steps up the slope you are already at the source.