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From Virieu-le-Grand, Belley or Culoz, head towards Artemare and then Champagne-en-Valromey. Follow the D31 north to Sutrieu. Park near the town hall.
(S/E) Head west opposite the town hall via Chemin de la Fruitière. Start climbing towards the forest and cross the Planachat road. Take the start of Chemin des Écoliers and after 100 metres, turn right onto theGRP® Balcon du Valromey marked forest path.
(1) The route then follows the edge of the forest northwards to Ruffieu. It starts to climb towards Les Buissons, continues on level ground and then descends towards Lompnieu.
(2) Do not descend to Lompnieu but continue through the forest, passing near an old quarry (Le Creux de Sable) and an old water tower.
(3) Climb back up the hillside to reach a forest road, which you follow downhill to Les Vibesses.
(4) Turn left to climb back up into the forest, taking a steep path straight up the slope, then veer right to descend to the D 31 south of Ruffieu.
(5) Turn left onto the road and, after 100 m, leave it to cut straight across towards Ruffieu via a path that descends and then climbs back up to the centre.
(6) At the crossroads (fountain), turn right towards Pont des Tines. The road becomes a path that descends, veering left until it crosses the Séran on a stone bridge.
20 m after this bridge, a path branches off to the right towards the Séran giant's kettles, where erosion has created a natural arch, the "Pont des Tines".
(7) Return to the path, take it to the right to climb back up and exit the forest. At the junction at 645 m, continue straight ahead towards the east until you reach the D54 road, which you take to the right, along the Ruisseau de la Serra stream to Moulin Livet.
(8) At the crossroads, turn left onto Chemin de Réoux and follow the road uphill to Réoux.
(9) Turn left to continue along a path that climbs through the forest, emerges into meadows and joins the Route des Alliettes, which you follow to the right until you reach the Étang des Alliettes.
(10) Walk along the lake and continue south on the road that descends to Songieu.
(11) In the centre, turn right onto Route de Châteauneuf towards the south-west. Leave the Grotte du Pic trail on your left and at the next crossroads, turn left heading south to go to the Ruines du Châteauneuf.
(12) Visit the site and continue south to the viewpoint.
(13) Return to the ruins.
(12) Just after passing them, take a path on the left between hedges that descends to join the road that has made a detour. Take it on the left to descend to Bassieu.
(14) At the junction with the D54, cross carefully to descend straight down towards the Séran.
(15) Cross the bridge and climb up a steep hill opposite. Before reaching Chavillieu, turn left towards Lilignod onto a road that descends gently to the bridge under Lilignod.
Stay on the right bank of the Séran and a few metres after the bridge, a path descends to the Puits des Tines (be careful, this site is not secure).
(16) Return to the road and follow it westwards uphill. At the first crossroads, turn left onto Chemin de Richin, pass a few houses and then a bridge over a leat. At the next junction, leave the road towards Ossy and continue straight on towards Sutrieu, cross a road at Sous la Venne and, at the church, turn left to join the D31 and then the town hall car park (S/E).
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