Park in the car park at the Éguilles chairlift in Valberg.
(S/E) Follow the path northwards towards Valberg and you will soon reach marker 16. Turn left and begin the climb to reach the Col des Atres at marker 14.
(1) Turn left onto the track, which quickly becomes a path running down the centre of a ski slope. Continue on to reach the left bank of the Ruisseau du Vallon de Pinguiller.
(2) Continue on to reach a ski run at marker 22.
(3) Take it to the left, then quickly leave it to the right, before a winter sports facility, to follow the edge of the woods. Follow a circular loop to reach the Col des Anguillers and the lake of the same name at marker 24.
(4) Go round the lake, follow the track towards the Cime du Raton and reach a crossroads of paths.
(5) Take the left-hand path and continue the climb up a grassy slope. Cross the track and then reach the Adrech de Forche antennas.
(6) Go round the antennas. Then continue in the same direction along the track and reach the Cime du Faux Raton.
(7) Pass beneath the Cime du Faux Raton and continue along this track to reach the Cime du Raton.
(8) Descend a few metres to reach the start of the Crête du Bois Noir.
(9) Take care from here: follow the ridge line as closely as possible where a path is present, whilst remaining cautious. The rocky outcrops of the Illion are strangely shaped. Reach the end of this ridge at a large 4 x 4 m boulder blocking the path.
(10) Turn left. Head left into the woods, which descend steeply but along a very good path.
You will come to an old, overgrown track that has fallen into disrepair, littered with stones and branches. At this point, turn left and follow this descending track. You will then reach the forest track known as the Route du Bois Noir.
(11) Take it to the left. Follow this pleasant track through a forest of fir and spruce trees, cross the Ruisseau du Vallon de Cabane Vieille and pass the Margoulins chalets to reach the junction at marker 19 further down.
(12) Continue straight on towards Les Launes and, at marker 18, reach the Ruisseau du Vallon de Challandre.
(13) Follow the left bank of the stream along the track to return to the car park at the Éguilles chairlift (S/E).