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To get to the start, head towards Villards d’Héria. From the town hall, a sign points you towards Lac d’Antre, located about 3 km away. Park your car on the left before the lake, opposite the Lac d’Antre Friends’ pavilion.
(S/E) To start the walk, head towards the right bank of the lake, passing to the right of the small building. Follow the bank to the small reservoir at the far end of the lake.
(1) Lac d'Antre outflow: cross the small reservoir, noting the resurgence on your right through which the water rushes. Continue along the lake on the path through the woods, which is more or less marked, to reach the farm visible on the eastern shore.
(2) Grange du Lac d'Antre: it was here, on the site of the farm, at the foot of the cliff face and on the lake’s edge, that temples dedicated to Mars and Bellona, the Roman gods of war and water, were erected.
Continue along the lake on the Grange du Lac d'Antre forest road. At the left-hand bend, leave the forest road and take the path heading north, then continue straight on along the Roche d'Antre forest road.
(3) At the highest point of the forest road, take the hairpin bend southwards towards the viewpoint. After a steep, stony climb, follow the forest path heading south-west and continue straight on, ignoring the marked paths branching off to the left.
(4) Roche d'Antre: view of Lac d'Antre, the viaduct and, on a clear day, the Jura Mountains and Mont Blanc.
Continue north-north-east along the path that runs alongside the cliff for about 200 m, then turn north onto the wider path which descends steeply. At the first junction, take the path branching off to the right, turn north-east into the woods and stay on this path for about 1.2 km.
(5) Turn left, heading west, and continue to the Roche d’Antre forest road. Cross it and continue along theGR®9for about 150 metres. Then leave theGR®9, which branches off to the left, and continue straight ahead due north.
(6) At the bottom of the descent, at the junction, head west-south-west along the path branching off to the left, then turn right at the first junction. You will then pass a pretty row of limestone slabs. If you climb onto these slabs, you will be able to see ‘lésines’ – grooves carved out by runoff and covered in lichen.
Continue on your way and, 50 metres before the forest road, turn off onto the small path on the left signposted “Puits Noir”.
(7) Le Puits Noir: once you reach thisfirst resurgence, continue along the path to the Y-junction and follow the path branching off to the right, which joins the forest road and leads to the “Puits Blanc”. After the Puits Blanc, continue along the forest road heading south-west, pass a house and head towards the Gallo-Roman excavations.
(8) Pont des Arches: at the Gallo-Roman excavations, walk along the fence to catch a glimpse of the site and the Pont des Arches, then retrace your steps to rejoin the forest road and continue along it for about 400 m towards the village of Villards d’Héria.
At the junction by the first houses, turn left into Rue du Moulin, cross the bridge over the Héria and continue south-west along the Route du Lac d’Antre until you see the bridge.
(9) 30 m before the junction, take the small path branching off to the right to pass under the arches of the bridge. At the bottom of this path, turn 90° to your left towards the south. Cross the bridge over the tram line and stay on this path until you reach the junction with the Lac d’Antre forest road.
Continue south for 100 m and take the path on the left, then immediately turn onto the path on the right to reach the starting car park (S/E).
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