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Park in the car park of the Chapel of Saint-Thomas, which you can visit before setting off. You are situated amongst the three man-made hillocks of Saint-Pierre-de-Chandieu, known as poypes.
(S/E) Turn right onto Avenue Mozart. At the bottom of the descent, leave the road and take the Chemin de la Poype on the left as it climbs.
(1) You’ll come to a road; follow it to the right. Then take the next small path on your left. Follow it until you reach a road, which you’ll follow to the right for about fifty metres. At the crossroads, take the Chemin des Dames on the far left. Continue along the path past a gas installation, until you reach a tarmac road.
(2) Take the path on your left towards the pylon. Continue straight ahead along the path, ignoring the paths branching off on either side. You will reach a junction shortly after a 90° bend to the right.
(3) Continue straight ahead, then leave the path by keeping to the left to follow a narrow track along the Ozon stream at the edge of a large maize field. Take care when leaving the track, as you will come out onto the busy D151, which you follow to the left.
(4) Immediately after the bridge over the Ozon, take the track on the right, then turn right again just after that. Continue straight ahead, passing a track on the right, then another one shortly afterwards.
(5) Take the third path on your right. After a 90° bend to the right, take the path on the left and follow it to the first house in Chaponnay.
(6) When you reach the road to Flassieu, cross it and take the path going uphill directly opposite. Shortly afterwards, take the path on the left (Chemin du Recours) and continue straight on.
(7) When you reach a tarmac road, with a pond on your left, take the path on the right towards a clump of trees and some villas, which you go round to the left. Finally, take the Luzinay road on your right. At the next junction, continue straight on until the 90° bend to the right.
(8) Leave the road and take the path straight ahead on the left, then, immediately after, the one on the right as it climbs. At the top of the hill, you cross from the Rhône into the Isère. Continue straight ahead onto a road, keeping to the left after the bend, towards Les Vignettes. After the high-voltage power line, leave the road at the bend and take the path on the left.
(9) Shortly afterwards, turn onto the path on the left. Follow the tarmac road that continues from the path to the next junction. Then take the road on the left and go round the Ollagnon house. When you reach the D151 again, cross it and follow it to the right for 50m.
(10) Turn left and walk down the meadow to the path at the bottom, which you follow to the left. Follow the S-shaped path and you will come to a copse and a small stream.
(11) Cross it if it is not too wide or muddy. Otherwise, go back a little and cross it to the right, going round the copse. Then join the path on the right at the top of the slope, crossing the anti-vehicle barbed wire, and continue keeping to the right.
(12) A little further on, take the straight path on the left. At the next bend, ignore the path on the right and enter the woods. This path marks the boundary between the Rhône on the left and the Isère on the right.
(13) As you leave the woods, take the path on the left. Continue keeping to the right. At the next fork, go straight on, ignoring the path on the left, and continue to the mill ford.
(14) Cross the Ozon stream over the stones, then continue left, heading uphill towards the castle visible on the hilltop. When you reach a tarmac road, follow it to the left.
(15) At the crossroads, take the road leading uphill to the right, then keep right at the next two junctions. You will then arrive at the chapel and its car park, your starting point (S/E).
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