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Start from the car park in the hamlet of La Fromagerie.
(S/E) From the car park, cross the D39, head left then turn right onto Chemin de Lajoux. Quickly ignore Chemin du Lac d’Ilay on the right and continue straight on towards the forest. As you emerge from the forest, pass a horse paddock on the left and turn right twice to follow Chemin du Raffour before reaching the first houses of Le Frasnois via a village street. At the junction, before the D75, take Chemin de l’Auberge on the left and proceed to another junction.
(1) Turn right onto the main street of Frasnois (Route des Lacs) and turn left, passing the town hall, then look out for Chemin du Coin d’en Haut straight ahead.
(2) Follow this path to the wayside cross located before the entrance to the campsite and take the path on the left, continuing to the hamlet of Narlay. In the hamlet, turn right once, then left, and follow the northern shore of Lac de Narlay. The path heads south-east then south-west to the boundary between the municipalities, which marks the start of a barely visible and poorly signposted path that climbs to the left.
(3) Follow this path north-eastwards, following the sporadic yellow markings, to the unspoilt viewpoint overlooking the village of Narlay and its lake.
(4) After the viewpoint, join a forest track and follow it to the left. At the right-hand bend in the track, there is a cross marking the access point to the Caverne à la Vieille, situated a few dozen metres below. At an old viewpoint, marked on the map before the vegetation grew over it, the path climbs back up to the ridge and then continues along the ridge generally due south. Before the descent due west, take a short detour to another unspoilt viewpoint with views of the Jura mountains.
(5) Retrace your steps and descend due west for a few dozen metres to the forest track, then follow it to the left. At the 829m mark, just under a hundred metres after the sharp right-hand bend, leave the forest track and take the path on the left.
(6) Follow the path down to the D75.
(7) Cross the D75 with care and follow it to the left for about 250 m, then look out for the signpostedGR®® 559A path on the right.
(8) Follow theGR®® de l’Échappée Jurassienne as it winds its way up to the ridge of the Côte de Maclu. Follow the ridge to the next legendary viewpoint, the Belvédère des Quatre Lacs.
(9) Continue along the signposted ridge path to reach the Belvédère des Trois Lacs (near a small road).
(10) Continue along the ridge path until you reach the junction where you can join the road, then turn right.
(11) Continue on the GR®® to reach the Pic de l’Aigle.
(12) Descend from the Pic de l’Aigle via theGR®®. After an initial steep descent, at the first subsequent junction, turn right and follow the GR®°°®° towards Ilay.
(13) Turn right onto the forest track, then at the first bend to the right of the track, take a path on the left leading down to the D39. Cross the D39 twice and take a path overlooking the road to the entrance of the hamlet of Ilay.
(14) Take the road on the right for about 100 metres.
(15) On leaving the hamlet, turn left onto theGR®® path to the edge of Lake Ilay and walk along the beach to the car park by 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 taken on the way out to return to the La Fromagerie car park (S/E).
Tourist office
Moderate 
Association / Club / Walk leader
Visorando Member
Easy 
