Park in the car park of the Fondurane Biological Reserve.
(S/E) Cross the bridge over the Biançon (a tributary of Lake Saint-Cassien). Continue straight ahead on the Fondurane path. You will come to a Y-junction.
(1) Keep to the right, ignoring the path marked by a barrier on the left, which is the return path.
About 100 m further on, turn right onto Chemin de la Basse Carpenée and continue straight ahead until you reach the metal barrier (point G56 on the Basse Carpenée).
(2) Continue along this same path, climbing in a series of switchbacks at first, then straight ahead. You will reach a second metal barrier, near a cistern marked CLN2, on the left side of the path.
(3) Go around the cistern. Keep left, a hundred metres further on, to follow a path that serves as a shortcut and continue climbing a little before a long descent. Start another climb, pass under a power line and reach a fork.
(4) Turn left and follow the Chemin des Crêtes towards Fondurane. Continue climbing alongside the EDF power line, then pass under it twice. Les Esterets du Lac and the A8 motorway can be seen below on the right. Lake Saint-Cassien is visible from time to time.
(5) Pass under the EDF power line for the third time and begin the descent. You will reach the junction with the GR®49, which runs alongside the lake (elevation 66).
(6) Continue left on the track that leads to the barrier seen at the start.
(1) Retrace your steps to return to the car park where you started (S/E).