Park on the D612 at a place called Sandron.
(S/E) Take the RJ (red and yellow) marked trail where the sign indicates Pas de l'Allier.
Cross through the undergrowth, staying on this path. Reach this pass overlooking the Petits Goulets road.
(1) Take the good gravel path that descends rapidly along the edge of the cliff.
After passing a climbing site, you will reach a small path leading to Pas des Voutes.
(2) Take it on the right. Continue along this path and you will come out at the Pas des Voutes (sign).
(3) Stay on the right-hand track and climb gently to reach the highest point (1,250 m).
(4) This ridge overlooks the Bourne Gorges. Continue along this track until you reach the Plan crossroads.
(5) Then turn left and head towards the hamlet of Le Briac.
(6) Return to the D612 road, turn right and then return to the car park (S/E).