Start from the car park, Rue du Maréchal Foch.
(S/E) Leave the parking lot and cross the road. At the crosswalk, continue for a few metres on your right, then take the path on your left.
(1) At the wooden gate, take the first path on the right and follow it straight ahead along a small stream.
(2) At the fork in the road, take the track on the left, then at the next one, keep right and join a road.
(3) Cross the road and continue along it on the right for 100m. Take the track on the left, which runs straight ahead through the trees. At the fork in the road, turn left.
(4) At Le Maresquel, follow the tarmac road on the right, then the first road on the left for 400m.
(5) Take the track on the left. Once you've crossed the road under a power line, continue straight ahead on a partially paved track. Take the first track on the left and follow it across the fields.
(6) At the junction with the GR®° 121B, turn left, going along a fishing pond and leaving it on the right, continue straight ahead.
Turn right onto a wide track that joins the barrier you passed on the outward journey.
(1) Return to the starting point.
(S/E) Continue around the Marais de Warlet. Follow the path away from the car park (as if leaving Fretin). Go straight ahead on a paved path that runs into a wood and joins the Marque.
(7) Follow the river to the left for almost a kilometer until you reach a footbridge.
(8) Turn left onto the footbridge, then left again to continue around the marsh.
(9) Take another footbridge on the left, cross a wood and enter a field.
Turn right to return to the car park (S/E).