Park in the large car park at Lac Saint-Clair.
(S/E) Take the footbridge at the start, go around the lake on the left, then turn left towards the campsite entrance, cross a small car park and join the road.
(1) Turn right and follow the road for 500 metres until you reach an intersection.
(2) Turn left onto Rue de la Mairie and continue straight ahead on the road. After 180 metres, the road turns right. Continue on this road, which climbs slightly.
(3) Pass this crossroads and you will reach an intersection with an oratory.
(4) Turn left; the road will soon turn into an uphill path. Ignore the side intersections. Then, as the route begins to descend, leave the path.
(5) Take the path furthest to the left, climbing steadily until you reach the end of a road.
(6) Do not continue along the road; turn completely left and continue until you reach a track. Turn left onto the track, which continues to climb, and after a wide circular you will reach the Sainte-Marguerite Chapel.
(7) Descend the track on the right and rejoin the road above the village of Arvillard. Continue downhill along the road, following a path that quickly rejoins the road. Pass two junctions on the right and you will reach a large crossroads.
(8) Turn left, and on the descent, pass two turnings on the left. Return to the village of Détrier, passing close to the cemetery and the church, and continue descending until you reach the outward route.
(3) Turn right and, after the town hall, take a path downhill to the left, which allows you to avoid the road for a short section. Then return to the car park via the road (S/E).
A lovely half-day walk...forest, meadows, villas and beautiful grasslands around the lake with picnic tables.