Starting point and access:
Suscinio beach car park. From the D198, between Sarzeau and Penvins, follow signs for Château de Suscinio. Pass the entrance to the castle and immediately after, turn left towards Landrezac. Then take the first right towards the beach: the car park is at the end of the road.
Yellow + red and white markings + directional signs
(S/E) Head west and cross the car park. Continue along a path on the edge of the marshes on your right, with the sea a short distance away on your left. A low fence on the left indicates that you must not walk on the dunes, which are fragile.
(1) At the first intersection, ignore the Sentier des Marais trail on the right and continue west-southwest on the often sandy path.
(2) Pass a small car park on your right, go through a forest gate and continue along a path lined with private property fences on your right. After a shaded section, ignore another small car park on your right and follow the wall of a property on your left.
(3) At the end of the path, turn right and walk along the beach on a wooden pontoon designed to protect the dune. At the end of the pontoon, continue along a path with property fences on your right. Pass through a forest gate and you will come to a small road.
(4) Follow the road to the left, cross a car park and continue along the path. Go through a chicane and continue along a fenced path with large cypress trees on the right. Take another wooden pontoon and, at the end, you will rejoin the tarmac road.
Yellow markings + directional signs
(5) Then turn right towards Kergorange (let theGR®34continue straight ahead). Follow a wide path under pine trees, bordered by a fence on the right. After passing a field on your left, you will come to a small road and follow it to the right. Cross the hamlet of Lan Hoëdic, ignoring the side streets.
(6) At the fork at the end of the hamlet, turn left (the right-hand road leads to the campsite). Enter Kergorange and turn right at the three-way junction. Ignore a dead end on the right and, at the "give way" sign, turn right towards Sarzeau-Centre. It is best to walk down the left-hand pavement and cross two dead ends, one on the left and one on the right.
(7) At the next intersection, turn right onto Impasse Victor Hugo towards Château de Suscinio. At the crossroads, continue straight ahead. After a water treatment plant on the left, the tarmac gives way to a dirt track. Follow this wide track south-east until it ends (wet passage).
(8) At the entrance to the hamlet of Sodrio, follow a road on the left, still towards the castle. At the fork that appears quickly, turn right.
(9) Ignore the Sentier des Marais trail on your right and continue east on the small, quiet road. As you approach the castle and the marsh, turn left onto this road and continue to an intersection. Then turn left towards the castle.
No signposts
(10) When you reach the foot of the castle, start the tour on the left on a stabilised path. Return to the tarmac road, follow it to the right and pass in front of the castle entrance.
Yellow signposts + directional signs
(10) Continue straight ahead for a few dozen metres, then turn left towards Landrezac. Take the first right towards the beach and, at the end of this road, you will find the car park (S/E).
Obstacle: just after point 5, once you've turned right and entered the pine forest, 3 large trees have fallen and are blocking the path. I climbed them
(but that's just me and my physical condition!!). It might be possible to go round them to the left but it's marshy. Possibility to be checked.