Departure from Nanteuil-Saâcy station (Transilien line P, on the section between Paris-Est and Château-Thierry).
(S) Exit the station on the Paris-Est side (if arriving from the opposite direction, take the underground passage). Turn left twice and cross the railway tracks at the level crossing. Keep left and follow the D55 towards the Marne.
(1) Take the bridge, cross the Marne, cross the D402 and follow Rue du Bac opposite. Take thefirst left, follow the red and white markings ofthe GR®®14Aand ignore a small street on the right. The street turns right and arrives at the foot of the church on the left.
(2) Continue straight ahead and cross Rue de Passy on the left. At the T-junction immediately ahead, follow the street to the left. When this street turns right, climb a staircase on the left (leaving theGR®® which continues along the road). Continue along a small, very steep and grassy path (nettles). Climb through. At the crossroads (elevation 121), go straight ahead and continue climbing between the vineyards.
(3) Just after the vineyards, join theGR®®11AandGR®®14A. Follow the marked path to the left and stay on the balcony above the vineyards and at the edge of the woods. Further on, enter the woods. Reach a crossroads at elevation 133.
(4) Turn right onto theGR®®14A(let theGR®®11Acontinue straight downhill). You will come to a small road; follow it to the right. At the antennas (elevation 147), leave the road and take a path on the left (follow the markings). At the next fork (elevation 156), turn left. Continue north to the next intersection.
(5) Then turn left (leave theGR®® trail on your right). Descend and join the houses in Courcelles-sur-Méry.
(6) Take the path on the right. Stay in the woods, heading north-northwest to Caumont (views of the Marne on the left).
(7) At the entrance to Caumont, just after a red half-timbered house, descend a steep path on the left. Cross a road and continue to the Marne.
(8) Then turn right, cross a small bridge and walk along the Marne on your left. At a crossroads, turn left to stay as close as possible to the river. Walk along the Marne for a long time, ignoring all the paths on the right and passing under a railway bridge. Further on, the path turns right between the fields and moves away from the river.
(9) Take thefirst path on the left and walk along the Marne at some distance on your left. Ignore the access to a pumping station on your left and continue to a crossroads (elevation 58).
(10) Then turn right. Go over the railway line. Walk alongside the Ferme de Godefroy, ignore a street on the left and continue straight on along Rue de la Marne. At the end, first turn left then right to follow Rue Joseph-Paul Mesle to the church in Chamigny.
(11) Go around the church on the left and take thefirst left, a small road, and follow the red and white markings ofthe GR®®14A. Go straight ahead to the south-west (with fruit trees on the left).
(12) At the end, turn left and descend towards the village of Tanqueux. Come out onto the D80 and first turn right then left to follow theGR®® along Rue de Tanqueux. Cross the railway line again and continue towards the Marne.
(13) Turn right just before the river, then join it and walk along it on your left. The path then veers slightly away from the Marne and passes under a high-voltage power line. Pass the river stop and cross Rue de Vannes on the right-hand side.
(14) Then turn right into Rue de l'Hôpital. At the end, first turn right then left, and after a few dozen metres, take a left onto Rue des Hauts-fosses.
(15) At the crossroads, turn right onto Rue Michel Fauvet. Before the bridge, turn left onto Rue de la Gare. Then turn right to cross the D603 and reach La Ferté-sous-Jouarre station (E).