The departure point is on the right bank of the Vilaine, at the bottom of the village of Arzal, near a place called "Vieille Roche". Please note: there is another "Vieille Roche" on the other bank!
(S/E) Head north-west, following the red and white markings ofthe GR® 39. At Vieille Roche, climb to the right alongside the old houses.
(1) At the top of the hill, turn left; the path enters the woods and opens onto a small bridge. Continue on the left through the reeds, then the gorse.
(2) Turn right towards Coscat; leave the village of Coscat and turn left onto the road.
(3) Very quickly, turn right towards Trénué. The path passes between the houses; continue straight ahead towards the north. After a few hundred metres, take the path on the left, then turn right to rejoin the road.
(4) Follow the first road on the left; at the first bend, continue straight ahead on the path opposite. The path branches off to the left.
(5) As you approach the village of Kermoizan, turn right without reaching the farm. At the end of the path, first turn left then right very quickly. Turn right onto the road for a few metres and continue on the path that branches off to the left.
(6) Turn right and pass through Kerboyant; the path continues until it meets a wide trail.
(7) Turn left and head south; you will pass very close to two wind turbines. At the next fork, turn right towards Kérantréh. At the edge of the path, a sign indicates "borne de l'abbaye de prières" (abbey prayer marker).
(8) In the middle of the houses in Kerantré, turn left; you will find yourself on a pretty path and very quickly discover a panoramic view of the mouth of the Vilaine and the ocean. Continue along the path until you reach the crossroads with the road. Turn right for about 20 metres, then turn left; the path is narrow and joins theGR® 39 at Pointe du Moustoir.
(9) Facing the Vilaine, you will see the bell tower of Pénestin on your right and the village of Tréhiguier directly opposite; on the river, you will see the shellfish farmers' barges. Turn left and follow the signs forthe GR® 39.
(10) Turn left and climb the hill on the road; pass the village of Kerdavid and continue on the road; theGR® is clearly marked on the right. Walk along a small path until you reach a road.
(11) Be careful to take the small path opposite and not the main road that leads into the fields! You will soon reach the junction you took on the way there.
(2) Head straight ahead and finish by following the same route as on the way there to reach Arzal (S/E).
