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Coming from Chambéry, cross the hamlet of Boyat. Descend to the banks of the Ternèse stream and park in the car park near the bridge known as the Boyat bridge.
(S/E) Take the wide path on the left bank that follows the stream. You will reach the Ternèze Canyon: you will visit this site on your return. Continue on the left, passing by the old mill.
(1) Go straight ahead, ignoring the path on the right, which will be the return route. Then keep right at the fork in the path leading to Curienne and continue to the next three-way junction.
(2) Turn right, then right again at the next crossroads to reach the Sordet bridge: gentle descent to the Ternèze stream.
(3) Pont du Sordet: it is forbidden to use this bridge, so you will have to ford the stream. After the ford, continue on the left, passing through the scree, and join the path that climbs and turns into a wide track. Join theGRP® of the Massif des Bauges.
(4) Follow theGRP® to the left (red and yellow markings, directional sign). After several steep hairpin bends downhill, you will reach a footbridge.
(5) Cross the footbridge over the Leysse. Continue on the other side for about 150 m to reach the viewpoint over the Trou de l'Enfer.
(6) Retrace your steps and cross the footbridge again.
(5) Climb the steep switchbacks and return to the junction you took earlier.
(4) Ignore the path on the right that you came along and continue straight ahead towards Curienne (signpost) on a paved section. At the 90° bend, continue straight ahead on a wide dirt track.
(7) Take the wide path on the right (GRP® Boucle du Plateau de la Leysse). At an enclosure, the path becomes a trail and leads to the Ternèze Canyon footbridge.
(8) After the footbridge, descend slightly along the river, go around the ruins of the mill and rejoin the path you took on the way there.
(1) Turn left to return to the car park (S/E).
Superb hike, refreshing
Visorando Member
Easy 
