The springs of Boulon

At the foot of the rock, the crack from where the spring of Boulon flows is hidden. It hardly ever flows (a few days per year), but the flow can go up to 50L/ s. The water comes from the limestone massif of the Petit Luberon which is a karstic topography: It is characterized by forms of dissolution which can be superficial (lapies) and underground (caves) and which promotes the water flow. Rainwater penetrates the surface and sinks into the massive through to more or less wide cracks before exiting here.