Departure from the Saint-Joseph Chapel north of Vernas.
(S/E) After visiting the site (chapel and resurgence), cross the bridge, take the path on the right, then the next one on the right. Walk a few metres and turn right again onto the path that goes uphill. Reach the plateau (altitude 386) and continue, turning left twice. After a series of hairpin bends, the path reaches the edge of the cliff. Ignore a path on the right and continue along the path on the left uphill until you reach a fork.
(1) Turn left and follow the cliffs to the archaeological site of Larina. Visit it by following the information panels as you cross the site heading east to the signpost for "Fontaine de la Vie" (Fountain of Life).
(2) Head towards the fountain (spring) via a balcony path. The fountain is on the right.
(3) Leave the path and take the one on the left, which descends steeply towards the south-east, then turns right towards the south and remains on the balcony above the Rochers de Ruet. Reach the Châtelans road in Larina at an altitude of 357 metres.
(4) Cross the road and continue along the path through the woods. Join a good path in a clearing and take it to the left towards Châtelans. Pass two paths on the right and reach the next fork.
(5) Continue to the right towards Mollard Subin/quarries. The path descends towards a large working quarry; turn right opposite the entrance. Continue downhill into a small valley (Cros Couronné) until you reach the signpost.
(6) Take the path on the left which climbs up, then descends into another valley and joins a path at the bottom.
(7) Take it to the left towards Châtelans, then leave it immediately afterwards for a path on the right towards Mollard des Barres. Climb up through the forest to a plateau, cross a clearing and join a cross path at a place called Le Putier.
(8) Take it on the right, towards Leyrieu. Leave the plateau and stay on the hillside until you reach a fork.
(9) Turn left towards the Chapelle des Aviateurs and climb up through the clearings to the chapel. Read the signs explaining the two plane crashes that occurred here and see the ex-votos in the chapel.
(10) Retrace your steps to the previous fork.
(9) Descend to the left towards Leyrieu. Take care as the rocks are slippery. The path descends more steeply at the power line and joins another path which continues downhill to the foot of the hill at a place called La Combe.
(11) Take the path across to the right, towards Vernas, without going towards the first houses in Leyrieu. Continue through the undergrowth until you reach a good path.
(12) Take it on the right and continue straight ahead through the woods. Walk along the high wall of the Château de Vernas property. At a fork (Chôgnes signpost, altitude 265 m), continue along the left-hand path until you reach a large basin (water reservoir, possibly a former fishpond belonging to the château) fed by a spring that is sometimes dry, which can be seen immediately above the basin. The water from the basin feeds the château grounds.
(13) Continue along the path which leads to a small road (altitude 245 m). Turn right onto this road and continue to the entrance to Vernas. Note the Château du Cingle on your left. Continue straight ahead through the village. Note the fountains with explanatory panels and continue to the Chapelle Saint-Joseph (S/E).

and forget about paths that don't exist on the map. So you need to think a little to find the right route, but it's easy to get there.