Fontaine means “fountain,” which is about 40 kilometers east of Avignon. There is France's largest world's fifth most important underground spring, said to be rainy season gushing height even hundreds of meters unusually spectacular, but recently the climate abnormal spring water has not erupt, in 1985 finally detected the fountain depth of a stunning 315 meters! Summer is the dry season, the springs in the huge cave are very calm, and the springs here appear mysterious blue.