Near Pellafol, this cool and peaceful route, along the banks of the Souloise, invites you to discover a geological curiosity: the sources of the Gillarde, the second largest springs in France.
From Corps, head towards the EDF dam. Cross the dam and then the hamlets of "Les Payas" and "La Posterle". Continue towards Le Dévoluy and turn left at the first intersection (about 4km after the hamlet of "La Posterle"). 700m after the turn, you will find the car park on your right.