Park in the Château du Guildo car park.
(S/E) Head down towards the harbour and cross the bridge. On the other side, some steps allow you to pass safely under the bridge. To the left of the restaurant, take Rue de La Petite Suisse and you’ll come to a crossroads just before Les Vallées.
(1) Turn left onto theGRP®® Tour du Penthièvre to Poudouvre trail, marked in red and yellow, heading towards Les Vallées, and discover the tidal mill on this branch of the Guébriand, a birdwatcher’s paradise.
(2) Continue along this path, following the left bank of the Arguenon. You’ll then pass a viewpoint over the Arguenon estuary and discover the Saint-Pierre chapel. Watch out for the tide if the tidal range is very high. The path then leaves the riverbank to reach the village of St-Pierre.
(3) At Saint-Pierre Chapel, turn left onto a pleasant path under the trees that runs alongside the village. Walk past a campsite and, just after it, turn right to join the D19.
(4) Turn left along the departmental road until you reach the bridge.
(5) Do not cross the bridge; instead, continue to the right to explore the parish enclosure in the old village.
(6) Return to the bridge.
(5) Take the path on the right to cross the Arguenon and follow the signs for Saint-Jacut to the right. The path runs alongside the Arguenon, crosses the Montafilan bridge and leads to a copse.
(7) Continue left along the village of Créhen. This is the old tram line that crosses La Ménardais and then Ville Tideu. Shortly afterwards, you’ll come to a crossroads with a track near a large farm.
(8) Turn right to quickly reach a covered walkway.
(9) Return to the previous junction.
(8) Take the old tram line again to the right. Cross the D786 to take the track opposite, pass the Grand Pré and continue due north to return to the starting car park (S/E) at the Château du Guildo, a natural and historic site well worth exploring.
Superb! An easy path on the right bank of the Arguenon; the difficulty lies on the left bank in the "submersible" section. You walk at silt level, sometimes submerged despite the tall grass on which you can lean;