The route starts from the Nordic chalet car park.
(S/E) Cross the road to reach the entrance to the Saint-Martin-en-Vercors communal forest at the Porte d'Herbouilly signpost. Head towards Favier following the GR®.
(1) In Favier, turn right towards Chemin de la Pia.
(2) At Chemin de la Pia, leave theGR® and turn right towards Pas de Saint-Martin, now following the yellow-green trail. Look out for the path climbing up the cliff on the right, marked in yellow and green.
(3) When you reach the paragliding launch area, cross it and follow the path that runs along the cliff towards Herbouilly. From this ledge, you can see the Vierge du Vercors, a rock that has broken away from the cliff.
(4) Turn left towards plot 5. At plot 5, turn right towards Les Tenailles. At Les Tenailles, cross the road and take the path opposite towards Herbouilly.
(5) At Herbouilly, cross theGR® trail and follow the signs to the Herbouilly spring. Pass the spring and enter the woods to reach the Pas de la Sambue. From here, look for the yellow-green markings and follow them. Cross an old forest path and continue up the hill opposite. Stay on the path that climbs to the left. You will come out onto a wide path; follow it to the left.
(6) At Pas de la Sambue, take the path on the right towards Sambue. The path climbs steeply, so keep following the yellow-green markings on the trees to stay on track.
(7) When you reach the top of Sambue, follow the ridge path to begin the descent, following the yellow-green markings to Les Girodines. At Les Girodines, turn left towards Pas de l'Âne.
(8) At Pas de l'Âne, turn right onto the path that descends towards the Roybon crossroads. At this crossroads, take the carriage road on the right towards Roybon. Pass in front of the inn towards Porte d'Herbouilly to reach the car park (S/E).



