Start: Arriving from "Pont-Réan", park in the car park at the village entrance.
(S/E) From the car park, head towards the pretty old houses opposite the lock and mill.
(1) Pass by the lock. Observe the mill on the opposite bank. Continue along the towpath.
(2) Just before the SNCF* (Railway) bridge over the river, leave the towpath and turn left onto the path leading up to the bridge. A footbridge crosses the river, parallel to the TGV** railway line. At the end of the bridge, turn right onto the road leading down to the river.
(3) Leave the path opposite which leads to the mill site. Turn left, and at the entrance to the car park, follow the GR® path on the left (white and red markings). The path quickly climbs to the heights. Various viewpoints offer magnificent panoramas of the Vilaine river and the Boël site.
(4) Continue following the GR®39. The trail passes slightly away from the military site ("Le CELAR"). Short climbs, sometimes quite steep, but without danger and in a very shady area.
(5) The GR® skirts the fence of the military site, continue straight ahead. Leave the military zone. The GR® passes in front of isolated villas and continues through undergrowth until you arrive at the hamlet of "La Bouchetière".
(6) Continue along the GR® until you reach a place called "Les Vallées".
(7) Leave the GR® on your left and turn right onto the D39, toward "Guichen". We soon come to the bridge over the "Vilaine" river, which we cross. (Beware of heavy traffic at this point).
(8) Leave the road at the end of the bridge. Turn left onto the path leading down to the river. Follow the towpath on the left, pass under the bridge and continue to the car park on the left (S/E).