Park in the Siou Blanc car park.
(S/E) Take the track heading north, which follows the red and white markedGR®99, to reach the karstic cave of Palan.
(1) Continue along the track to Les Jounces. Leave theGR® on your left and take the path on the right. You will reach a fork under the high-voltage power line.
(2) Head north-east towards Les Bidoufles, following the track. You will reach the foot of this hill.
Leave Les Bidoufles on your right and follow the track, then a short stretch of tarmac road.
(3) Continue along the path heading due east, often marked by cairns, to reach theGR®51crossroads.
(4) Ignore theGR® and turn right, almost 180°. You will reach Pas du Pilon.
(5) Turn left at a right angle. Continue in a south-easterly direction, then south-westerly after the wide circular bend in the path. You will reach the cave area.
(6) Enter by turning right, then follow the path marked by cairns. Take the opportunity to visit the caves (see § During the hike). Continue through this area to reach the Chemin de Moriere crossroads in Martrieux further on.
(7) Cross the track and follow the path opposite. You will reach another four-way crossroads.
(8) Take the path on the right heading north-west. This path is marked with cairns. After a clearing, you will come to another crossroads.
(9) You can turn left to reach the caves or karstic caves. Reach the crossroads and turn left to return to the crossroads of the circular under the power line.
(2) Turn left and retrace your steps to return to the Siou Blanc car park (S/E).
