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Start from the Place des Tilleuls and the Coyron fountain near Coyron Town Hall.
(S/E) Head towards the north-eastern exit of Coyron via Rue de la Fraite (D83E1). At the signpost marked “Grosse Pierre”, follow the signs for Près Vuillerme/Fraite/Meussia. Continue along the forest track (marked with black MTB signs). At the crossroads, keep right until you reach the signpost for “Près Vuilerme”, pointing towards Meussia.
(1) Head north-east for 50 m, then at the signpost for “Roche Brison”, turn right towards the south-east. At the T-junction, keep right to reach Meussia.
(2) In Meussia, pass to the right of the fountain and carry straight on along Rue de la Côte, following the signs for Coulouvre. Cross Rue de Champagne to continue along Route Forestière du Molard (Black MTB trail). Follow this path south-east for 3.6 km and pass through the hamlet of Coulouvre.
(3) A few metres past the last house in the hamlet, at the signpost for “En Chaspereille”, take the path heading south towards Puit de Fyète. At the Y-junction, stay on the path on the right and continue in this direction until you reach the forest road. Then turn left onto Rue de la Forêt and head north-east for approximately 900 m.
(4) At the bends, leave the forest road and take the forest track heading south. Stay on this track for about 1 km.
(5) When the forest track splits into two paths, continue along the one on the right heading south. At the T-junction, turn left, then right at the next T-junction. Carry on until you reach a stony forest track at Grange de Troile.
(6) At the signpost marked ‘En Troile’, turn left towards the south-west onto the stony path, which later becomes tarmac (watch out for loose gravel as the descent is steep). At the Y-junction, continue along the tarmac path on the right, which climbs steeply.
(7) At the signpost marked “Tongea”, turn right and take the path on the left towards Moirans-en-Montagne. Stay on this path for around 400 metres, then turn left towards the east into a vast meadow (be careful, there are no signs at this point and although the path is clearly marked on the ground, it may be hidden by tall grass depending on the season). Follow the path through the meadow to En Tyre.
(8) At the En Tyre viewpoint, continue to the right past the bench, heading north-west (caution: technical descent, especially in wet weather). At the bottom of the descent, head left then right until you reach the houses
(9) At the junction with Rue de Franche Comté, carry on straight ahead into Rue du Collège, pass the fire station and turn right to go past the stadium and the sports hall.
(10) Opposite the sports hall car park, turn left onto the path blocked by a blue barrier and carry on heading south-west.
(11) At the T-junction, turn left towards the south and continue along the right-hand edge of the meadow running alongside the D470 (please note: depending on the season, the grass may be tall). Continue to the southern end of the meadow until you reach the junction between the edge of the woods and the safety fence along the departmental road.
(12) Enter the woods on the left and look for a path through the undergrowth. Continue southwards (please note: in wet weather, this path can be very slippery) until you reach a fork in the path after passing under a power line and then taking a wide left-hand bend.
(13) Carry on to the right, passing to the left of the garden centre “Les Jardins de la Fontaine”, and you’ll find yourself on Avenue de Saint-Claude. Then head towards the roundabout, take thesecond exit and follow the signs for Martigna on the D299 for about 200 m.
(14) Leave the D299 and follow the track to the right which runs alongside the D470 departmental road, arriving next to the roundabout at Vernoire’s West Industrial Estate.
(15) Cross the Route de la Grange au Guy and continue along the track running alongside the D470. At the signpost marked ‘Sous le Pont’, follow the signs for Regadoir/Charchilla.
(16) At the end of the track, take a short detour to the left at the Belvédère du Regardoir to take a moment to admire the view over Lake Vouglans. Then continue across the car park to the left to find the signpost marked “Le Regardoir”, and follow the signs for Voie Romaine/Charchilla (yellow markings) along a narrow, technical path which can be slippery in wet weather.
(17) At the end of the path, alongside the D470, continue to the left.
(18) Turn left onto the small path before the D470; this is the Ancienne Voie Romaine. Walk past the Auberge Jurassienne, cross the road and continue along the Chemin À la Mercantine, opposite, which runs parallel to the D301.
(19) On the Route du Lac, at Charchilla, continue westwards for about 100 metres, then turn onto the path heading due south until you reach the D301.
(20) Cross the D301 to rejoin the Chemin Forestier du Chenet opposite. At the signpost for ‘sur Mairey’, take the path heading north-west towards the Pierre Fendu/Belvédère sur la Frate/Maisod (GRP® Tour du Lac Vouglan, marked in yellow and red).
Continue following the markings to Plage de la Mercantine.
(21) In front of the entrance to Plage de la Mercantine, continue northwards and walk along the lake on the path that passes in front of the car park, which joins the path leading to the port of La Mercantine.
At the end of the path, walk past the refreshment kiosk on your left and head towards the harbour master’s office (the white building overlooking the jetties).
(22) At the harbour master’s office, carry on along the small road leading up to the Maisod holiday village. Enter the village by going through the barrier and follow the signs for Maisod/Pont de la Pile on theGR®® Tour du Lac Vouglans. Go round the holiday village on the left, as if heading for the reception. Cross the car park and head up the steep path heading north, passing behind the holiday village.
(23) At the three-way junction, continue westwards on the GRP® Tour du Lac Vouglans trail, following the red mountain-bike markings.
(24) At the signpost for “Sur la Frate”, follow the signs for the Belvédère de la Frate/Le Parchet. Take the path on the left and stop at the viewpoint to admire the scenery and the lake (picnic table). Then continue north-east along the narrow path.
(25) Turn left to head down the steeply descending path (caution: this fairly technical path can be very slippery). Descend to the lake , then turn right at the junction to reach, several hundred metres further on, the Route Forestière de la Frate.
Carry on north-west, then take the first steeply descending lane on the left and head for the small, unspoilt beach bordering the lake. After enjoying the spot, return to the Route Forestière de la Frate and continue left towards Maisod until you reach the D301.
(26) Carry on along the road, following the path for about 100 metres, then, just after the Maisod sign, take the small grassy path that climbs to the left. Walk along the left-hand side of the houses in the housing estate to rejoin the path through the woodland, which takes you back to the D301.
(27) Back on the D301, head north and continue along the GRP® Tour du Lac Vouglan immediately on the right towards Pont de la Pyle and Coyron. Cycle for about 2.2 km to the Belvédère de la Braise.
(28) Take in the view of the lake here, then carry on in the same direction until you reach the junction of the GRP® with the Ancienne Voie Romaine.
(29) At the junction, cross the Roman Road and, at the signpost for “Le Citernon”, follow the signs for Coyron/Meussia to the north-east. Cross the D470 with care and head for the Fontaine de Coyron and the Place des Tilleuls (S/E).
Visorando Member
Moderate 
Very difficult 
