Access via the Col de la Bataille. Park in the car park at the entrance to the tunnel coming from Léoncel or wherever you can find a space if you arrive late.
(S/E) From the car park, cross the road and take the track that climbs opposite and goes around the northern end of the Rochers de la Sausse and the tunnel to reach the Col de la Bataille.
(1) Take the wide track heading south and quickly turn left onto the Col de Toulau path.
(2) At the pass, turn left towards Roc de Toulau and, after a hairpin bend to the right, leave the path heading west and join a grassy ridge between the two rock bars. Pass just below several caves.
(3) From here, the route is obvious and numerous animal tracks will guide you to the exit. A marmot guards a cave near the exit.
(4) The exit is marked by a rocky outcrop that you can go around on the right or left to reach the grassy plateau and the path leading to Roc de Toulau.
(5) At the summit, admire the 360° view and especially the Rochers de la Sausse to the west, which is the continuation of the route. From the summit, head east on a grassy ridge that turns north. Look for a hump topped by a large cairn.
(6) This bump overlooks four rocks, one of which is pierced by the Arches de Toulau. After the arches, climb back up the ridge and head for the north-east summit to admire the view towards Bouvante and its lake.
(7) From the summit, following the contour lines more or less, head towards the north-west ridge and begin the descent to the Col de la Bataille. Go through the tunnel to return to your starting point.
(S/E) Take a path on your left to reach the ridge near the Rochers de la Sausse. The path is well marked, runs along a fence and offers views of the landscape on all sides. Be careful of the impressive drop on the east side. You will arrive at the end of the fence.
(8) Pass underneath it to continue your progress to the Pas de la Sausse.
(9) Enjoy the view of the Crête de Bouchère, which extends the ridge, and the nearby Grandes Pennes, which conceal a magnificent arch. Retrace your steps.
(8) Go back under the fence and cross the mountain pasture without losing too much altitude to re-enter the woods. The path is not very well marked, but numerous blue dots on the trees or rocks will guide you. Stay close to the wide ridge to the west if you lose the trail; it will lead you directly to Pas de Chovet and its pylon.
(10) Go through the fence to the right of the pylon to enter the woods and head north-east to find a path that leads north towards point 1407. A short descent will take you to the Rucla Arch on the left.
(11) From here, the view overlooking Léoncel is magnificent. Retrace your steps towards Pas de Chovet.
(10) Stay on the path that heads left towards the east and joins a track after a steep descent.
(12) Continue straight ahead on the track that takes you back to the Col de la Bataille road, then turn right at the car park where you started (S/E).