If you are coming from Paris or Reims via the A4 motorway, exit at Château-Thierry, follow signs for Soissons, then at Rocourt-Saint-Martin take the D310 towards Fère-en-Tardenois and finally the D2 for 2 km.
Start in front of the American Cemetery in Seringes-et-Nesles.
(S/E) Walk along the left side of the cemetery on the D2, then take the road on the right that goes up towards Seringes-et-Nesles.
(1) In the village, take Rue du Jeu d'Arc, the second road on the right, and at the crossroads at the entrance to the forest, follow the path on the left along the edge of the forest, passing two paths on the right.
(2) At the intersection, continue straight on until the second crossroads.
(3) Turn left onto a path through the fields where you can admire the Château de Fère.
(4) At the crossroads, leave the farm on your left and continue straight ahead towards the château, which is open to visitors. Exit at the tennis courts and take the sandy path on the left.
(5) At the crossroads, turn right (yellow mark on a tree) then, after 30 metres, turn left and follow the path which curves sharply to the right (north-east).
(6) At the crossroads, go straight ahead and continue along the path (see photo).
(7) Stay on the main path, take the path slightly to the right and walk along the left side of a pond. At the end of the pond, at the crossroads, turn right and head towards the Croix de la Neuville.
(8) At the cross, turn left and head towards the village of Mareuil-en-Dôle.
(9) Take the D79 for 100 metres, then Rue Casenière. At the end of the street, you can admire the 12th-century church.
(10) Retrace your steps and take Rue Casenière back to the intersection.
(9) Continue your walk by following the D79 to the left, Rue de la Forêt. Continue on the plateau.
(11) At the bend, leave the D79, enter the forest via the wide avenue lined with oak trees opposite and continue for 2.5 km, ignoring all turnings on the left and right.
(12) Follow this path, which has few landmarks except for a few mountain bike markers. At the edge of the woods, you will see Nesles Castle. Descend through the fields.
(13) In front of the château, turn right.
(14) At the car park, turn right and enter the forest. After 100m, turn left and head towards the cemetery (S/E).