On the outskirts of Saint-Laurent, head towards Saint-Joseph-de-Rivière. Follow the signs for Tourbière de l'Herrétang.
Park in the car park.
(S/E) Cross the bridge to enter the wetland. Go to the crossroads of the circular.
(1) Turn left onto the path along the marshes. Follow the D520.
(2) Turn 90° to reach the crossroads of Les Tourbières and the canal of the same name.
(3) Turn left and follow the canal. Join the road and the water treatment plant.
(4) Return via the other bank of the canal, crossing it on the concrete bridge shortly before reaching the fork.
(3) Continue along the canal to the Marais crossroads. Turn right and head for the circular crossroads.
(1) Turn left and follow the same route back to the car park (S/E).