Car park and start of the walk Place de l'Église Saint-Gervais in Aumont-en-Halatte.
(S/E) When you leave the car park, go left and turn right onto Rue Henri Duprez. Pass the town hall on your left, then turn left onto Chemin de la Procession. Ignore the two streets on the right, then turn right at the end. Turn left onto Chemin du Moulin at the next crossroads and join Rue Louis Blanchet.
(1) Take the street on the right, then turn left onto a path. At the crossroads, turn right, then right again a few dozen metres further on.
(2) Cross Route de la Queue de la Brosse carefully and follow it to the right. At the next multi-way junction, take Route d'Amont,the first left, then turn left onto the track that runs alongside the D1330 for 400 metres until you reach a junction with the GR® hiking trails.
(3) Take the track on the left (Chemin des Vaches), which supports the GR®12 and GR®655.
(4) Cross Route de Condé and Chemin de Valroy, then carefully cross Route de la Queue de la Brosse again. Leave the two paths on the left and turn right, ignoring the GR®12B coming from the left. You will reach the Poteau de la Belle Croix and its car park.
(5) Continue on the GR®12 and GR®655, ignoring the paths on the right and left. Leave the next two paths, cross Route Dumas and Chemin de Chamant.
(6) Turn left onto Route Neuve des Blancs Sablons, leaving the GR®. Reach the Poteau d'Auteuil. Take the path on the right (Route d'Auteuil) to the D565.
(7) Follow it to the left for 100 metres and then turn right onto the next path. Pass the next crossroads, continue for about 50 metres, then turn left onto Route de Fleurines. Pass the next path, then cross the GR®12B (Chemin de Brenouille). At Poteau de Fleurines, go straight ahead, cross the D565 carefully. The picnic area shown on the map does not exist (there may be a few tree trunks). Continue straight ahead on Route de Fleurines, passing several crossroads, including Carrefour Bourbon. Cross Carrefour aux Curées,
(8) Turn left at a right angle. Cross Route Bourbon, ignore a path on the left and reach the junction with Route de l'Arbre à Fougères.
(9) Take the path on the right. Continue straight ahead at Carrefour de la Croix de la Livrée and do the same at Carrefour de Bois Franc. Ignore the path on the left further on and continue to the junction with Route des Suisses.
(10) Turn left onto this road, then turn left again onto the next path, Chemin du Bac. Continue straight ahead on this path until you approach the D606e.
(11) Just before you reach it, turn left, then right before you quite reach it. Without going there, turn left onto Rue de la Fontaine Saint-Gervais, which continues further along the road.
(12) At the crossroads, turn right, pass in front of a pumping station and join the car park (S/E).