Start and finish at Bois de Bahurel, in Redon. This hike largely follows theGR®347on the way there and theGR® 38 on the way back (white and red markings in both cases).
(S/E) Follow theGR®347trail towards Saint-Perreux (west). Turn right onto a path above the Nantes-Brest Canal on your left. This leads to a small road, which you follow to the left. At the next junction, turn left at an acute angle and, after about 100 metres, you will reach the edge of the Nantes-Brest Canal. (Take care when crossing the road, as there is no pedestrian crossing).
(1) Turn right at a sharp angle and follow the towpath with the canal on your left.
(2) At La Potinais, cross a bridge and you will reach the confluence of the canal and the River Oust. Turn north and leave the river behind to reach Chapelle Saint-Méen.
(3) Turn left onto a path just after the chapel and keep the Oust on your left.
(4) Reach the Rocher viewpoint and enjoy the view!
Head back down the forest paths towards the campsite and the L'Île aux Pies beach bar.
You can stop for a picnic or a hot meal at a reasonable price (open only during the summer season).
Continue north-west, keeping the Oust on your left. Pass Île aux Pies, cross the Ruisseau de la Bataille and then turn east. Reach the hamlet of Port Corbin and turn left, heading north, onto the D60 (be careful, this is a busy road and the verges are not very wide). Cross the Pont de l'Aff bridge and you will find yourself on the D149. Follow this road, which branches off to the left, to the Château de Sourdéac.
(5) About 100 m after the château, take the path on the left and continue with the Aff on your left until you reach the Glénac pier.
:6:: Continue west and, after about 100 metres, leave theGR® 347, continuing straight ahead (west) with the Oust on your left to reach the Pont de Branféré bridge, which crosses the Oust.
(7) Cross the bridge and continue along this road towards the south-west, cross the Nantes-Brest Canal (8), continue straight ahead and, 100 metres further on, at the next crossroads, rejoin theGR®38trail. Turn left and follow theGR®38eastwards, staying above the canal. After descending and climbing back up to cross a stream, you will come to a small road which you follow to the left.
(9) Leave this road after less than 1 km to take a forest path that climbs to the right. Continue east with the Nantes-Brest Canal on your left until it meets the Oust, and you will see Île aux Pies. Turn south-east and rejoin the towpath at the via ferrata/tree climbing site.
(10) Continue south on the towpath. Leave the towpath before the small bridge (11) and take the forest path on the right.
(12) After crossing Ti Kendalc'h, take the road to the left and then turn left towards Boro.
(13). Cross the village and take the road on the left to rejoin the towpath and continue southwards along it with the Oust on your left. You will reach the Potinais Dam.
(14) From the dam, continue along the Oust on your left until you reach the underside of the D164 bridge (Redon/Saint-Vincent-sur-Oust road).
(15) Go up onto the bridge and turn left until you reach the Courée roundabout, which you will see in front of you.
(16) Cross the roundabout, continue straight ahead, go up Rue de l'Ermitage and at the end turn left onto Rue de Bahurel. You will reach the starting point (S/E).