The starting point is accessible via the D122 either from Lagnieu or from Sault-Brenaz. It is a car park located at the eastern exit (when coming from Lagnieu) of Saint-Sorlin-en-Bugey in front of the Lycée d'Enseignement Agricole Privé (L.E.A.P.). Next to the car park is the Calimacha spring, with a wash house under a four-sided roof, surrounded by a park featuring a wooden sculpture of a winegrower with his hood.
(S/E) Go up the Fay road that runs alongside the car park and turns left in front of the school. Continue through the village, keeping to the right of the road. Pass the church and you will be on theGR® de Pays du Beaujolais au Bugey. Go up the road until you reach the bend.
(1) The trail starts on the right just after the bend.
(2) After 400 m, turn left towards Le Bessey (signposted), cross the road, D 60b, and keep left on the main path. At Le Bessey, turn right towards the east, then leave this road on the left and continue on the GR®.
(3) Cross the D 60 and continue south-east.
(4) Leave theGR® and continue straight ahead on the well-marked path. At the fork, keep right. Further on, turn left and continue until you come to a large green gate.
(5) The gate and vegetation slightly hide the path that branches off to the right. Follow it for about 500 m.
(6) Turn left at a right angle towards the village of Souclin, which you can see below the cliffs. Cross the village via Rue de la Prelle until you reach Rue Principale. Turn right and pass under the church. After 300 m, you will come to a large stone cross on the right-hand side of the street.
(7) Turn left onto Impasse de Fornon, heading north. After 100 m, keep to the right. Then take the hairpin bend to the left and climb up to the road.
(8) Go down the road for 10 m to find the path opposite. Then take the path on the left heading west and keep left along the cliff until you reach the Roche de l'Église, marked by a cross.
(9) Return by the same route to the stone cross at Souclin (point(7))
(7) At the cross, continue straight south on Rue de la Combe, which passes in front of the cemetery.
At the cemetery, leave the street and take the path on the left. Cross the small stream, the Nérivent, and reach the D 99 road. Follow it to the right towards the west for 200 metres.
(10) Turn left onto a path that goes under the road and in the same direction, marked in green and red. It starts at the last telephone pole on the line that runs along the road.
(11) Cross the D 60 heading west and continue on the path opposite, leaving the signs for Brénaz and Bouis on your left.
(12) After 900 m, walk along the right-hand side of the field for about 400 m, then enter the woods where the path continues.
(13) When you reach a path coming from the left, continue north-west and pass a pumping station.
Return to the path you took on the way there.
(2) Continue in the opposite direction to return to the car park in front of the L.E.A.P (S/E).