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Departure from the Carrefour de Montgeron (accessible by car only from Montgeron town centre). There are numerous parking spaces along the circular road.
N.B. The numbering of the forest plots has been changed and there are two types of numbers on the trees: the old ones painted directly on the trees (now faded) and the new ones on metal plates. In the following description, reference is generally made to the new numbers and when the old numbers are mentioned, this is specified. The IGN base map still shows the old numbers.
Red and yellow markings
There are also circles of different colours: stick to the red and yellow markings ofthe GRP® Ceinture Verte de l'île de France
(S/E) Go to the end of the car park, cross the Route de Chalendray, leave the information signs on your left and go through a forest barrier. At the end of the circular road, follow a wide track on the left. At the crossroads, take the second path on the left, which is narrower and heads south, winding through the undergrowth. At a fork (not shown on the map), turn right and you will come out onto a wide path.
No signposts
(1) Cross the track and follow the path opposite (red and yellow cross, sign for "Allée cavalière"). Cross the Route Forestière de Maupertuy and continue south-southwest along a wide lane. After crossing a path coming from the right, you will come to a crossroads (plot no. 43 opposite; former nos. 79 and 77 on either side).
(2) Then turn right and, at the next crossroads (plot no. 36), continue straight ahead. Ignore a path on the right and you will come to a stabilised path coming from the left: follow this path on the right and, after a few metres (plot no. 29), take another stabilised path on the left. Follow a regenerating plot on your right and reach Carrefour Charmant.
(3) Take the first path on the left (south-east). Ignore a path on the left and, at the next crossroads, at the edge of plots nos. 29, 30, 23 and 22, turn left (yellow marker). At the next crossroads (Carrefour du Lancé on the map), turn right (south-west). After about 300m, take the path on the left that passes between plots nos. 37 and 38 and walk for about 500m.
(4) Look for a large oak tree marked No. 37 on the left and take the path that branches off to the right (signposted "Allée cavalière"). Follow this winding path through the woods. At the end, turn left onto a tarmac road and continue for a few metres.
Red and yellow + yellow markings
(5) At the crossroads, turn right and, at the fork that immediately appears (plot no. 47), take the left-hand path and wind your way through the woods. Ignore a path coming from the left (not shown on the map) and continue to a crossroads (boundary stone).
No markings
Leave theGRP® straight ahead and follow a wide path to the left for about 250 metres.
Round yellow + round white signpost
(6) At the crossroads, turn right onto the path that runs between plots nos. 50 and 49. The path is poorly marked in places and winds through the woods. Cross a tarmac road and continue straight ahead on the path (formerly nos. 230 and 231).
Round yellow sign
At the next junction, continue straight ahead (ignore the white round signpost on the right). After about 100 metres, you will come to a poorly marked junction: there is a plot of land undergoing regeneration opposite and a pond (not shown on the map) a few dozen metres to the right.
(7) Then turn left (there is no sign but a yellow circle further on). Walk eastwards and ignore the logging tracks on either side. At a fork, go left. Cross a long track and continue straight ahead on a narrow but well-marked path. Zigzag under the trees and through the coppice.
No signposts
(8) At the next crossroads, turn left (ignore the yellow arrow pointing to the right). Cross a stream over a small wooden bridge, then another over a footbridge.
Round yellow signpost (rare)
(9) At the signpost marked "Sénart en quête d'un secret" (Sénart in search of a secret), continue straight ahead in the opposite direction of the sign. Cross a paved road and continue straight ahead, still on a more or less marked trail that zigzags.
No markings
When you reach a paved road, follow it to the left (ignore the yellow arrow to the right) until you reach a large roundabout with a circular lawn in the centre.
(10) Then take the first path on the right, which starts between plots nos. 94 and 96. At the next crossroads, turn left between plots nos. 94 and 95. At the Carrefour d'Orléans, take the third path on the left (west). Go around a pond (which may be dry) on the left and you will come to another crossroads.
(11) Then turn right (north-west) onto the road that starts alongside a plot of trees on the left and a pine forest on the right. At the next three crossroads, continue straight ahead. About 250 m after the third crossroads and just before a road on the right, look for a path starting on the left (be careful).
(12) Turn left onto the path (not shown on the map) and leave a cluster of pine trees on a hillock on your right. Walk through the pine forest and follow the pond on your right. Pass through a deciduous undergrowth and approach the edge of the pond to reach its northern end, which is again lined with pine trees. Then head north-east, without really following a path, to reach the forest road you took earlier after a few dozen metres.
(13) Then turn right. After about 100 metres, turn left onto a path between plots 83 and 84. Note a pond on the left, then walk along a plot of regenerating forest on your right.
Red and yellow markings
(14) Shortly before the junction with a forest road, take a path on the left (not shown on the map) and follow a canal on your right (also not shown). At the end, ignore a red and yellow arrow pointing to the left (oldGRP® route?) and a cross of the same colour, and turn right to reach the Carrefour du Rut (pond on the left). Then follow the wide forest road to the north-west (2nd on the left) to return to the car park (S/E).
Visorando member
Easy 
