Park in the small car park near La Sotière.
(S/E) Opposite the buildings, take the dirt track on the right that leads to the Chambre du Loup. After about 300 metres, take the shortcut on the right and head towards Lyris.
(1) At the three-way junction, take the path on the right, following the red disc markings. Continue along this path, which curves sharply to the right before reaching the Haut des Courts crossroads.
(2) Take the path on your left, leaving the red disc markings, and walk for about 150 metres.
(3) Descend via a small path on your left: be careful because the path is rarely used and not very visible. You will soon reach the Goutte du Roulier (stream) and follow it until you come to a dirt track at a hairpin bend.
(4) Take this path on the left and, a few metres further on, follow the small path on your left which continues downhill along the stream. After 500 metres, cross the stream and go down the left bank.
(5) At the dirt track, turn left and move away from the stream: the nature reserve is on your left. Walk for about 500 metres.
(6) Take the small path on your right that leads to the Cellet Stream. This is another discreet, little-used path: check the perimeter carefully. Cross the stream, come to a T-junction and take the path on the left to climb up along the stream. The path crosses it twice before reaching the Cellet Forest Road.
(7) Continue left on this forest road for about 200 metres.
(8) At the first fork, leave the forest road and take the dirt track on your left for 300 m, until you reach the next crossroads.
(9) Turn left onto the path leading to the Chalet de la Piste. Immediately after this, take the path on the right, which climbs towards La Sotière. Just before you reach the hamlet, you will come to a crossroads. Follow the path on your left to return to the car park (S/E).