Arriving from Les Vans via the D901 (towards Saint-Paul-le-Jeune), after reaching the plateau, at the end of a straight stretch, take the D252 (towards Maison Neuve) on the left. The Ours et du Lion car park is about 200m on the right (the first car park).
(S/E) At the end of the car park (signposted "L'Ours et Le Lion"), a path leads off to the left, uphill towards the south. At the large rocks, keep to the right and continue south, then descend into a rocky area. You will arrive at the Merveilles crossroads.
(1) Continue straight ahead at the crossroads. At the next T-junction, ignore the right-hand branch to the west which joins the D901 and the left-hand branch to the east which goes into the woods. Continue straight ahead on the path shown on the IGN map (but not on OpenStreetMap), which is not visible. Make your way in this southerly direction using your GPS (the undergrowth is not too thick).
Further on, a little to the right, you will find a track to follow to the left and south, parallel to the D901 (traffic visible and audible). The trail widens. Keep right at a crossroads, then left at a three-way junction where a mountain bike trail marker in the opposite direction is visible. You will come to a junction with a carriage road at an elevation of 199 metres.
(2) Continue straight ahead and keep right at the next three-way junction. At another three-way junction, follow the small path on the left. There is a collapsed dolmen at the next crossroads on the right-hand corner. Continue straight ahead and cross a field. At the entrance to the hamlet of La Lauze, pass between two buildings and take the street in the hamlet. Cross a road, continue straight ahead and turn left at the end of the street, then join the D202.
(3) Take the D202 on the right, follow it along the Granzon, cross the bridge and arrive at the junction with the D901 (Domaine des Lèbres).
(4) Cross the D901 and take the field path almost opposite. Leave a path on your right and continue straight ahead on the path, which curves widely to head north again. Continue straight ahead past the wooden hut and then the large crossroads. You will arrive at the submersible bridge over the Granzon (with a double row of limestone blocks on its left, probably the remains of old fords or submersible bridges).
(5) Take a wide path uphill, leaving the gate to Mas du Granzon on your left, and continue uphill until you reach a path on the left (signposted as a discovery trail). Follow this path, which climbs above the Granzon on its left bank and passes close to the left of the Résurgence de la Grille.
(6) The path then descends almost to the stream bed, heads north, crosses the stream and follows a series of meanders to the west on the right bank. After the Fontaine du Vedel, continue along the stream bed until you reach theGR®® 44 A (clearly visible red and white markings).
(7) Take theGR®® on the right uphill. You will come to a field of olive trees on the left and continue to the road.
(8) Take the road on the right and continue to a crossroads with a triangular traffic island (elevation 259).
(9) Take the road on the left, turn right downhill before a gate with several letterboxes. Turn left again at the bottom at the entrance to some properties, then right at the next T-junction. A hundred metres after the end of a left-hand bend, just after the houses, between two dry stone walls, the start of a path is blocked (March 2019) by brambles.
(10) Walk along the field next to the north wall of the path. At the end of the field, the path becomes more passable between the two walls. It is cleared before a road. Continue along the track until you reach the D901.
(11) Follow the D901 on the right for a few dozen metres and turn left onto the D252 to reach the car park (S/E).

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