Park in the centre of the village of Jas in the boules car park.
(S/E) Turn left from the car park, turn left again a few metres further on and follow the yellow-and-white markings and the black locomotive. You will reach a crossroads with a Black Cross.
(1) Turn right into Rue de la Croix Charmette. You will reach the hamlet of La Borgia. Continue straight on and pass the hamlet of Les Sapins. Take the path here and cross the River Doise. Then turn right onto theGR®89and head for the village of Salt-en-Donzy.
(2) Turn left towards the church and the town hall, then turn right onto theGR® to reach the junction with the D60.
(3) Turn left into the housing estate, then right; cross the D60 very carefully and continue straight on to the Ruines de Donzy neighbourhood. Continue right along theGR® to reach the monorail junction just before the Medieval Castle.
(4) Continue left, following the Ruisseau de la Charpassonne, along the monorail route until you reach the D113 just after the hamlet of La Valette.
(5) Turn right onto the Chemin du Bois de Serre to reach the hamlet of La Pelletière.
(6) Continue straight ahead on the D113 to reach the Y-junction near the hamlet of Chez Paradis.
(7) Turn almost 180° to the right towards the industrial estate and the junction with the D60.
(8) Cross it carefully and take the tarmac path straight ahead. Turn left at the next junction and arrive at the hamlet of Lachat.
(9) Turn right and you will find the yellow and white marker with the black locomotive. Continue straight along the path, ignoring all turnings to the right or left. At the edge of the woods, you will reach the Ruisseau de Vernailles.
(10) Follow its right bank, then cross it before reaching the D111.
(11) Cross it carefully and take the path opposite. Go straight on for a few metres, cross the bridge and then the Jas treetop adventure park until you reach the D111.1
(12) Cross this road carefully too, and take the path running parallel to it. Cross over again further on, taking care. Continue straight on, turn right at the cemetery, and you will then reach the boules car park in the centre of Jas (S/E).