1- At the starting post of the hike, go towards the church on the footpath, passing by the street "rue des Carriers".

2- At the post "Trept l'église", follow the direction Siccieu which goes round the church on the left by a small garden. After the gate, cross the D54 and take the opposite street. Continue until you reach the end of a cul-de-sac which you leave via a narrow passage. Then turn left. The road becomes a track, then a nature trail.

3- At the "La Sorbière" signpost, turn right towards Siccieu. The route joins a small road at a cross and an old bread oven. Turn left. The road, first dominated by the chapel Saint-Didier-de-Cozance located on a height, then skirts the pond of Fenières and continues by a wide track up to the post"Etang de Fenières".

4- Turn left, still towards Siccieu, past the"Etang Bouvet" post. At the "La Grande Taverne" sign, turn left onto a wide track towards "Dizimieu". At a large agricultural shed, turn right to reach the "Terre Villain" sign.

5- Head towards Trept. After 500 m on a wide track, the route turns slightly right onto a narrower track as far as the "La Gagne" sign.

6- Go straight ahead after crossing the road, direction Vénérieu, pass near the ‘Pelouses sèches’ landscaped area.

7- Turn left towards Trept. Cross the Espace Naturel Sensible des Communaux de Trept before going down to the D 517 at the "Bange" signpost.

8- Cross the road and take the street opposite as far as the Lavoir du Truffet. At the nearby crossroads, turn right. The route crosses the voie verte and continues around the village to a crossroads dominated by a cross. Turn left and follow the road up towards Trept church.