(S/E) Leave the harbour master's office car park and take the Chemin de la Chaussée, which heads north-west. This path runs alongside Rue Louis Brien on the right and, beyond that, the marshes. On the left is the ocean. At the first crossroads, go straight ahead and leave the dead-end path behind you.
(1) At the next crossroads, take the path on the right. Shortly afterwards, the path turns sharply to the left. At the next crossroads, ignore the paths on the right and left and take the footpath opposite, which leads towards La Boursinière. At La Boursinière, the path joins Chemin des Cents: turn left and continue with the marsh on your right and the ocean on your left. Pass the hamlet of Le Lac, then La Roulière.
(2) A little further on, at the end of the tarmac section, turn right onto the path and almost immediately turn left onto the path that runs alongside the Noirmoutier National Forest, sheltered by the coastal dune that separates it from the ocean. Pass three paths on the right and one on the left. At the next crossroads, continue straight ahead on the main path and stay on this path.
(3) The main path, which becomes tarmac, soon leads to a car park and picnic area. At a sort of square, turn right onto a road leading to the Murier neighbourhood: Rue du Grand Mûrier. The road leads to Chemin des Ransins (road). Turn left onto Rue du Grand Mûrier and follow it to the junction with Rue du Puits Namer.
(4) Turn right onto Rue du Puits Namer. After the houses, the street turns left.
(5) At this crossroads, turn right onto Chemin du Marché de Luzay, which goes around the Ménisière neighbourhood. This path turns left at an almost right angle; at this point, ignore the two paths that lead to the marshes on the right. The path now runs alongside the marshes. It leads to Chemin du Petit An, which you take by turning right. This new path goes around the Puits Namer neighbourhood and quickly continues along Chemin de la Bassetière. On the right-hand side, the path continues to run alongside the marshes. Pass a dead-end path on the right. Chemin de la Bassetière ends at a T-junction.
(6) Turn right onto the road (suitable for vehicles) that leads to the marsh. At the first crossroads with a road in a bend, turn left onto the road that leads into the marsh. Further on, pass a short dead-end road on the left. The road ends at a T-junction. Turn left to arrive almost immediately at another crossroads.
(7) Turn right onto the path that immediately crosses a small bridge. At the end of the bridge, the path turns left.
(8) At this crossroads, continue straight ahead, leaving a path on your left that almost immediately splits into two branches. The path turns right further on.
(9) At this inverted Y-shaped crossroads, take the path on the right, which turns left a hundred metres further on. Leave three paths on the right before the main path you are following reaches a T-junction. Turn left. After a hundred metres, the path reaches a track suitable for vehicles.
(10) Cross the bridge and continue straight ahead. Immediately turn right onto the road that runs along the south side of the stream. A little further on, ignore the path that branches off to the left. Immediately after, the path crosses another similar path at a T-junction. Turn left. Further on, ignore a single track that branches off to the left: this track is a cycle path. Further on, the track comes to a Y-junction: stay on the main track, taking the right-hand branch and ignoring the track on the left. The track joins Rue du Gabion at the first houses.
Leave Impasse de Devin on your right. At the next crossroads, continue straight ahead, leaving one road on your right and two on your left. Shortly afterwards, you will arrive at the roundabout near the harbour master's office. Turn right onto Chemin de la Chaussée. Return to the harbour master's office car park, the starting point of this circuit (S/E).