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Departure from the car park located near the D64, on the left when following it towards L'Isle-Adam.
(S/E) Take the path on the left (south-east), Route des Pavillons on the map. Cross a perpendicular path and take the first path on the left (Route Boby).
(1) At the next junction, turn left. Continue straight ahead for about 1 km until you reach the bridge over the N184. Cross the bridge to cross the road.
(2) At the end of the bridge, take the path on the left and ignore the two paths on either side. At the next junction, turn right and, after a few dozen metres, turn left. At the next fork, take the path on the right (south-east).
(3) At the next junction, turn right.
(4) Turn left onto Route André. Walk south-east, following a few small "roller coaster" bumps, and cross four perpendicular paths.
(5) At the crossroads, turn right onto Route du Poirier Greffé.
(6) Turn left onto Route du Tourniquet de Montsoult. At the next junction, turn right onto Route Boucault.
(7) At the Boucault crossroads, cross the D9 and continue along the path opposite. You will arrive at the edge of the forest.
(8) Turn right onto Route Tournante du Saut du Loup de Chauvry and stay on the edge of the forest.
(9) At the junction with Route du Poirier Greffé, turn left. Leave the forest, cross the road and turn immediately right. Continue to the edge of the forest.
(10) Turn left at the edge of the forest. Find theGR®1and follow it to the right. Turn immediately left and follow theGR® west then north-west to the D9 road.
(11) Follow the D9 to the left and pass under the four-lane road (N184). Continue along the road uphill, then take a path that branches off to the right and goes uphill (there is a barrier to prevent vehicles from entering).
(12) After a right-hand bend, leave theGR®1trail on the right and turn left (there was a burnt-out car wreck when I passed by). Continue north-northwest to the Porte Noire crossroads, where you will rejoin theGR®1 trail.
(13) Continue straight ahead with theGR® on Route Capitaine. Turn left with theGR® and follow the path along the edge. Walk along the quarries (do not climb over the barriers on the left as there is a ravine; take care with children or dogs). Beautiful view below over the Stors marsh. Narrow path normally closed to mountain bikes but clearly not respected (be careful).
(14) Turn right, still following the GR®. When it turns left, go straight ahead, diagonally to the right (north-east) onto Route du Vollard.
(15) At the second crossroads, turn right and follow the road in an arc, ignoring the paths on either side. Then turn east and then east-northeast.
(16) At the crossroads, take the road furthest away (Route du Hangar). Walk east-south-east until you reach the third crossroads.
(17) Then turn left onto Route Neuve. Cross a road and continue straight ahead to the starting car park (S/E).
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