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Departure from Bois le Roi station.
(S) Cross the station square and Avenue Gallieni to take theGR®1divert. Then go up Avenue de la Forêt to rejoin the GR®. 40 metres after the junction of Avenue Gallieni and Rue Pasteur, theGR® branches off to the right between houses.
Gradually, the houses become fewer and give way to forest. You will reach the forest after crossing the D138 departmental road, which has very little traffic. On the other side, follow the path called "Route du Lancer". It crosses another minor road, the Route Ronde, then merges with a small tarmac road for about 100 metres, which leads to the Rochers Canon car park. Leave it at the first bend and continue straight ahead, still on the "Route du Lancer" until you reach the junction with the "Route des Monts de Fays".
(1) Turn left to follow the "Route des Monts de Fays", which crosses the end of the Rochers Canon. Continue straight ahead at the first crossroads to stay on the "Route des Monts de Fays". Further on, you will reach a steep climb with a 40-metre elevation gain. Once you have climbed this, the path becomes flat again.
Arrival at the crossroads of the Monseigneur office
(2), continue onthe GR®1, which joins the winding road of the Cuvier Châtillon rock before leaving it 200 metres further on. TheGR® descends a little before reaching a crossroads, turn right and climb up a white sand path. Leave theGR® here and continue straight ahead on the "Route du Cuvier Châtillon". Descend into a pretty valley to reach a large rock formation called "La Merveille" 300 m further on. Here, cross the blue-marked trail no. 5.
(3) Follow trail no. 5 on the right. After passing the Sampitié shelter (letter V) on your right, you will see a Virgin Mary painted in 1890 by an abbot. A little further on is the cave of Sister Anne (letter T on the rock). Shortly afterwards, a path winds its way to the right between huge sandstone blocks where you will often see rock climbers in action. Do not take this path as it leads nowhere. Cross the winding tunnel of the Cuvier Châtillon (letter S). Further on, you will see a rock balanced on top of another, nicknamed "l'Aérolithe" (the meteorite). The trail continues to wind its way through beautiful sandstone blocks to the Epine crossroads, which serves as a car park for rock climbers. This is a very popular spot. You will rejoin theGR®1.
(4) Cross the RN7 using the underpass. Leave theGR®1again and take the "Route de la Solitude". After crossing the "Route de Barbizon", you will enter one of the prettiest valleys in the forest. It rises slowly up the slopes of the "Envers d'Apremont". When you reach the plateau, you will come across the blue-marked trail no. 6.
(5) Take trail no. 6 on the left. Follow the plateau. Cross the Mastodontes d'Apremont gorge (letter U) before you see the Mare aux Biches on your right. A little further on, there is a short, challenging descent through a beautiful rock formation called the "Roches de Rude" (letter S). At the foot of this chaos, you will reach a junction (with directional signs). Take the path on the left that continues downhill (Val des Mohicans). Continue through a rather strange and rugged landscape (lots of birch trees) called the Désert d'Apremont. Note a large isolated rock at the junction with the Route des Gorges d'Apremont, nicknamed the "Cerbère du Désert" (letter N).
(6) Take the "Route de Clair Milan" opposite, then the Route du Rapin.
As you approach the Route Ronde (D301), the path becomes less pleasant as it runs alongside the busy D607 (formerly the RN7). Cross the Route Ronde and continue straight ahead. The route eventually joins the main road at the Tillaie crossroads.
(7) Be patient and, above all, take care before crossing the N7. Take the small paved road opposite - the Route des Hauteurs de la Solle - which is now closed to cars. Follow it to the Gros Hêtre crossroads.
(8) Leave the tarmac and continue along the "Route de la Reine". Reach the junction with the "Route du Nid d'Aigle". Turn right to join trail no. 1 with blue markings.
(9) Take it on the left. This trail runs along the "ramparts" of Mont Ussy. In fact, it follows the heights of Mont Ussy along a ledge and, as it winds its way along, you will pass some very pretty rocks. Further on, after crossing the chaos of Shakespeare (letter L), you will see the Cid rock on your left, on which a Virgin and Child has been painted (letter M). Cross the road to discover the Grotte de la Maléna on your left. Continue until you reach a fork.
(10) Turn left, as you must not descend to the foot of Mont Ussy but stay close to its summit. Continue to the crossroads and the Augas cross refreshment bar, which is located after crossing the A6 road via the road bridge.
(11) Continue along the path towards the Calvary Cross, turning right (follow the signpost).
At the cross, there is a lovely view of part of Avon and Fontainebleau.
(12) Continue along the path that follows the "Reine Amélie" road for a short distance. Pass behind a series of rocks. After passing a large rock on which the Némorosa medallion has been fixed, the path begins to descend towards Fontainebleau-Avon station (E).
. The blue markings are not easy to follow in sector 3. The Apremont and Mont Ussy sectors are magnificent, with a few long stretches at the end (Route de la Reine), but it's well worth stopping for a beer in front of Avon station!
Visorando member
Moderate 
Very difficult 
