Car park in front of Maison du Temps Libre in Malbuisson.
(S/E) From the car park, head towards the lake, crossing Grande Rue and going down Rue de l'Église and Chemin des Landes to the water sports centre.
Turn right along the lake, following Le Sentier du Lac. Walk along the lake to the bar/swimming pool "Le Phare".
(1) Take the stairs and climb Rue du3e Régiment de Tirailleurs Algériens for a few metres. Follow Le Sentier du Lac again, taking the footpath on the left.
Staying on the same path, walk along the lake for a good distance before veering off slightly.
(2) Leave a yellow/blue marked trail (return trail) on your right and continue on the Sentier du Lac. Approach the lake again and continue to Anse de Chaon, where you will see a footbridge at the end of the lake. Continue along the path to this footbridge.
(3) Cross the footbridge and enjoy the protected biotope area. Continue along the path beside the lake, which leads to Port Titi.
(4) This small, picturesque harbour (originally a fishing harbour) is somewhat reminiscent of the fishing harbours on Canadian lakes. It is an ideal spot for a picnic. Walk around this small village and return the way you came, crossing the footbridge again.
(3) At the end of the footbridge, turn left and continue along the lake until you reach the D437 road. Cross the road carefully to reach the La Gouille car park.
Cross the car park, passing in front of the statue of the Virgin Mary.
(5) At the end of the car park, take the path on the right to climb 700 metres up the mountain and join a road that you will take on the right. Continue for 500 metres to reach a T-junction.
(6) From here, follow theGR® trail on the right towards Montperreux. Pass Les Granges Tavernier and continue along the road until you reach an intersection. Turn left towards Chaon/Montperreux. Continue for 250 metres along Rue du Centre and take the second left. Climb Rue du Crêt until you reach the D44.
(7) Cross the D44 with caution and climb to the right via theGR® trail, which ascends through the woods for 700 metres. At the leisure area, descend Rue de la Chapelle opposite for about 100 metres.
(8) Take the road on the right (Rue Fi Gagelin) to reach Montperreux.
(9) At the large crossroads (library, town hall, school), descend slightly to the right onto the D204 (Rue Fi Gagelin), towards Malbuisson, for 300 metres. Then climb up Chemin du Chablet on the left. Follow theGR® along the edge of the forest for 1.8 km to reach the woods on the hillside.
(10) Leave theGR® and head towards "La Source Bleue" on the right. Walk downhill for 350 metres to reach the Source Bleue. Admire its blue/turquoise-green colour.
(11) Retrace your steps and descend along the stream on the left-hand side until you reach Grande Rue (D437). Then turn left to cross the bridge, cross the road and take the path opposite. This time, the stream is on the right-hand side. Follow the yellow/blue markings to find the Sentier du Lac.
(2) Take it to the left for 2.5 km (same route as on the way there) to return to the car park in Malbuisson (S/E).