After the church, follow Avenue du Luberon, and take the first path on the right: Chemin de Boulon Haut just after the library and before Place du 19 mars 1962.
See transport to get there
On Chemin de Boulon, 600 m on the right you will see a first sign showing "Boulon 172", follow "Le Castelas".
At the second sign showing "Le Castelas 317 m" follow "Gorge de Badarel".
At the foot of the massif, you will see a third sign showing "Gorge de Badarel: 140 m". In order to return to Robion, do not follow the information indicated on this third sign, but take the first path on the right, next to the water point. It allows you to pick up the Chemin de Boulon and return to Robion (about a 30-minute walk).