It is a vauclusian spring, meaning water rises vertically from a subterranean cave system under pressure.
The underwater passage has been mapped by cave divers to a depth of 180 meters, making it one of the deepest known cave springs in France.
The water temperature remains a constant 10-12 degrees Celsius throughout the year due to its deep groundwater origin.
Archaeological findings in the vicinity suggest the site was used for cult worship during the Gallo-Roman period.
The spring is technically a resurgence where the river Douix regains the surface after traveling through limestone fissures.
Source de la Douix is one of the most powerful vauclusian springs in France, characterized by an underground river that emerges at the base of a 30-meter high limestone cliff. The water originates from a karst network and flows into a deep, turquoise-colored pool before joining the Seine river nearby. Divers have explored the submerged cave system reaching depths exceeding 180 meters. The site is a registered natural monument known for its consistent water output, which averages 600 liters per second. The spring serves as a significant hydrological feature of the Châtillonais region.
The wooden footbridge directly facing the pool allows for a centered shot of the cliff and the water outlet.
Bring a sturdy pair of shoes if you plan to walk the trail that climbs above the cliffs for a view from the top.
The area is shaded and damp, so bring a light jacket even on warm summer days.
Visit after a period of heavy rain to witness the spring at its most powerful flow.
Do not attempt to climb the steep cliff face directly above the spring as the limestone is unstable and dangerous.
Respect the fragile ecosystem; do not swim or throw objects into the water to preserve the clarity of the spring.
