Start from the Rue d'Hem car park (D64) next to the Texdecor factory.
(S/E) Opposite the car park, take Rue du Bon Conseil until it bends to the left.
(1) Turn right onto the small Chemin du Bon Conseil, pass under a power line and then turn left. Cross a road and continue along Rue du Grand Marais, which leads to a track.
(2) Continue straight ahead on this track until it joins a PR®.
(3) Turn right onto the PR® and follow it towards Lac du Héron. Cross a bridge and then the Dix Sept Bonniers woodland. The path veers right then left, passes under power lines and enters Forest-sur-Marque via Rue Moscou.
(4) Turn left onto Sentier de la Chapelle, then left onto Sentier de la Place, then right around the church.
(5) Turn left then right onto Chemin Fremeaux, then right onto Rue des Roloirs.
(6) After the school, take the second right onto the small road, then follow this road as it curves to the left. Pass a barrier, the river, and turn left twice to reach Lac du Héron.
(7) Take the GR® 121B around the lake to the left.
(8) Turn left along the GR® 121B, follow the Marque, pass a barrier and turn left into Rue Colbert
(9) At the bridge, turn left along Rue Colbert, and at the first crossroads, turn right and follow the Marque (GR® 121B). Cross Rue de Tressin and continue to follow the Marque.
(10) Turn left towards Willems leisure park (do not follow the GR® 121B). The path bends right, then left, and arrives at Rue de Willems. Turn left and then immediately right, bypassing the leisure centre. Follow the railroad line on the right.
(11) Turn left onto Drève des Marais and continue straight ahead. Leave Drève des Prés on the right and turn left.
(12) Turn right into Rue du Petit Marais and continue straight on, passing under a power line.
(13) Cross Rue de France into Rue du Bon Conseil and follow it.
(1) Leave the Chemin du Bon Conseil on your left and turn right into the car park (S/E).