La Fosse Dionne - Foutain of Gods

A quaint ancient fountain endowed with mesmerising power, teint-changing crystal waters emerging abundantly from a mysterious resurgence of karst spring. The « Divine fountain » - cult setting at the time of the Celts and very probably inherited from the prior cultures, in 1758 designed as public laundry is situated in the downtown of medieval town Tonnerre (roman Tornodurum, « fortress ») the department of Yonne, Bourgogne, France. « Fons Divina » derived from celte god Fons - fountain, bears the name apparently originated from Divona - the goddess of sacred sources (which also means divine), the site used to be the water rituals scene. The spring was considered votive and admitted to possess healing properties.

The fosse have been providing with water the oppidum Tornodurum (La Tène period) built on the plateaux “Mont Bellant” and “Vieux Châteaux”.
Fountains inexhaustible force squirts an average of 300 litters per second and reaches as much as 3000 l/sec during the freshet period. It’s hydrogeological system extends up to 40 km length. Preceding the resurgence segment of the underground river is explored to this day by speleologists up to a depth of 360 meters before meeting the landslide blocking the way. This source is alimented mostly by the rainfalls naturally collected and filtered passing through the layers of the karstic plateau dating from the Jurassic and neighbouring the Tonnerre town. Additionally the fosse is inflated by the waters of Laigne river loosing itself in the gouffre de la Garenne - chasm, situated between Villaines-en-Duesmois and Puits near the hamlet of Vaugimois. La Laigne reappear in the center of the town Laignes, grew on an Iron Age site, as another votive source of Laignes 20 km north-west, as well as in the fosse Dionne (43,5 km) which has an underground connection and as eventually the spring of Marceney. The waters of the fosse first joining the waters of Armançon river, then Yonne inflating Seine as is the case of Laigne.

It was strongly believed that to anyone who has ever seen the source, Fons Divina later returns in their dreams to procure quell and relief.

Outside of known technical and generally scarcely presented historical facts, this archaic formation remains obviously fully enigmatic. Several explorers found their deaths in the underground corridor, after what rights to poursuite researches has been strictly limited.