Les Gillardes gush out of a blockfield of enormous rocks into the Souloise river which extends over thirty metres.

If the massif's two rivers, La Souloise and La Béoux, don't collect all the precipitation which falls (as rain and snow), the lapies (limestone rocks with cracks in them) let the water infiltrate, helping to achieve this delicate work.

The result  is an underground circulation of water which appears as a double re-emergence like the one in Vaucluse to the north of Le Dévoluy: Les Gillardes.

After heavy rainfall and when the snow melts, Les Gillardes can "spit" up to 56 m3 / per second!

Another feature to admire is the 450 metre-high Les Voûtes cliff face, which we had the pleasure of watching René Desmaison climb.