Access: At the "Croix Sud" roundabout on the D6009 (ex-N9), head for the Zone Industrielle de la Coupe (dual carriageway). Go straight ahead at the next roundabout. At the third roundabout, take the third exit (Avenue Paul Sabatier), then the Chemin de Jonquières after the fourth roundabout. After crossing the Autoroute des Deux Mers (A61), go as far as Domaine de Jonquières and turn right onto Chemin Vicinal de Saint-Hypolite: parking area to the right of the fire hydrant or near the gas installation.
(S/E) From the parking, head for the nearby barrier.
(1) Cross the barrier prohibiting motor vehicle traffic and take the rightmost path at a fork with three tracks. Continue west to the junction with a track at Ruisseau du Veyret. Turn left and ignore the first fork in the road on the right.
(2) Turn right at the next junction and head 500 m south-west.
(3) Turn left at the intersection to join the Combe d'Enfer valley. Follow the stream of the same name in a south-westerly direction, crossing it several times.
(4) At the confluence with another stream, turn right then left and follow the stream before crossing it. Climb up the bed of the stream, passing carefully between rocks, then take a steep path on the left to reach a track.
(5) Turn right under the Roc de Fontfroide. Join another track at the Ruisseau du Roc des Naux. Rising to 285 m, these jagged sandstone rocks have been sculpted by erosion.
(6) Go straight ahead and, after two hairpin bends, cross the combe, then follow the valley for 700 m before coming to a fork in the road.
(7) Turn right onto another track and pass under the Croix de Fontfroide (a path on the left takes you up to the top of the hill for a fine view). Reach the outbuildings of the Abbaye Sainte-Marie de Fontfroide.
(8) On your right, you'll find the entrance to the restaurant and the entrance to the visit (for a fee). Turn left to pass behind the abbey.
(9) At the confluence of the Ruisseau de Fontfroide with the Ruisseau de la Quille, turn right onto the Voie Domitienne or Voie Héracléenne, which runs alongside the Ruisseau de Fontfroide (dry) on the right or left bank, depending on the successive crossings (yellow markings). Leave the valley and climb up to a track.
(10) Turn left onto that track and cross the Ruisseau de Fontfroide again. Turn right around a hill and join another track.
(11) Turn right and go 100 m before an intersection (barrier). Turn left and climb up, skirting, to the north, the ruins of La Quille (access on the right). Join another track after a barrier.
(12) Turn left into Chemin du Communal. Follow the ridge for almost 3 km to a fork above the Narbonnais waste treatment centre.
(13) Stay on the correct track on the left, paying no attention to the various forks in the road. Pass to the left of a knoll (elevation 176) and reach the gas installation you passed on the outward journey, then the parking (S/E) .