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Departure from the car park in the hamlet of La Fromagerie.
(S/E) From the car park, cross the D39, turn left and then right onto Chemin de Lajoux, then Chemin du Lac d'Ilay. Continue straight ahead towards the forest. At the end of the forest, pass a horse paddock on your left and turn right twice to follow Chemin du Raffour before reaching the first houses of Le Frasnois via a village street. At the crossroads, before the D75, turn left onto Chemin de l'Auberge and continue to another crossroads.
(1) Turn right onto the main street of Le Frasnois (Route des Lacs) and turn left, passing the town hall, and look straight ahead for Chemin du Coin d'en Haut.
(2) Follow this road to the crossroads before the campsite entrance and take the road on the left, continuing to the hamlet of Narlay. In the hamlet, turn right, then left and follow the northern shore of Lac de Narlay. The path heads south-east then south-west to the boundary of the municipalities, which is the start of a poorly visible and poorly signposted path that climbs to the left.
(3) Follow this path north-east, following the irregular yellow markings, until you reach the viewpoint overlooking the village of Narlay and its lake.
(4) After the viewpoint, join a forest path and follow it to the left. In the right-hand bend of the path, there is a cross which marks the entrance to the Caverne à la Vieille, located a few dozen metres below. At an old viewpoint, marked on the map before the vegetation grew, the trail climbs back up to the ridge and continues along the ridge, generally heading south. Before descending west, walk a few metres back and forth to another wild viewpoint with a view of the Jura mountains.
(5) Retrace your steps and descend west for a few dozen metres to the forest path and follow it to the left. At an elevation of 829 metres, a hundred metres or so after the sharp right-hand bend, leave the forest path and take the trail on the left.
(6) Follow the path down to the D75.
(7) Cross the D75 carefully and follow it to the left for about 250 m, then look for the signpostedGR® 559A path on the right.
(8) Climb the switchbacks along thisGR® de l'Échappée Jurassienne trail to the ridge of the Côte de Maclu. Follow it to the next legendary viewpoint, the Belvédère des Quatre Lacs.
(9) Continue along the marked ridge path to reach the Belvédère des Trois Lacs viewpoint (near a small road).
(10) Keep going along the ridge path until you reach the crossroads, where you can join the road and turn right.
(11) Continue and join the Pic de l'Aigle, still following the GR®.
(12) Descend from the Pic de l'Aigle via the GR®. After a steep initial descent, at the first trail junction, turn right and follow the GR°°®° towards Ilay.
(13) Turn right onto the forest path, then at the first bend to the right of the path, take a path downhill to the left until you reach the D39. Cross the D39 twice and take a path overlooking the road until you reach the entrance to the hamlet of Ilay.
(14) Take the street on the right for about 100 metres.
(15) At the exit of the hamlet, turn left onto theGR® until you reach the edge of Lac d'Ilay and follow the beach to the car park along the D75.
(16) Cross it carefully, take the path that climbs slightly and enters the forest, then turn left onto the path towards the hamlet of La Fromagerie. Turn left at the first houses and rejoin the path you took on the way there to return to the La Fromagerie car park (S/E).
Tourist office
Moderate 
Association / Club / Walk leader
Visorando member
Easy 
