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Starting point and access: Boissy-Saint-Léger station.
- RER - Line A, terminus of one of the sections.
Take exit 1, Place de la Gare.
Red and yellow + yellow (rare)markings
(S/E) Cross the station forecourt, then a street at the pedestrian crossing. Follow the street to the left and, shortly afterwards, go around the crossroads on the left to cross the N19 (Avenue du Général Leclerc) in two stages. Turn right towards the town centre and go up Rue de Paris. Continue straight ahead and cross Rue de l'Église on the left, then Rue du Temple.
(1) At the traffic lights, cross Rue de Sucy and continue straight ahead into Place de Verdun. Go through a forest gate and follow a wide gravel path between two walls. At the end, take the opening to the left of a metal gate to enter the Grosbois Regional Forest. Then turn left, passing a sign with a map on your left, and follow a tarmac path (Allée Élisabeth) lined with wide grassy verges.
No signposts
(2) At the first crossroads (footbridge over a stream on the left), go straight ahead. Walk along the left-hand side of the Pelouse du Progrès and you will come to a second crossroads. Turn left onto a gravel path, the Allée du Lapin. At the next crossroads, continue straight ahead. At the T-junction, turn right. Cross Allée Élisabeth (tarmac) and continue straight ahead along Allée Wagram.
Red and yellow markings
(3) Cross another tarmac lane (Allée Chevreuil) and follow a path through a grassy area. At the end, turn left and rejoin a stabilised path. Note the wall of the Domaine de Grosbois some distance away on the right. Pass by the Chêne des Bruyères (a dead tree that is still standing). Cross a stream, then turn left and follow the stream on your left. You will come to a crossroads (forest house on the left).
Red and yellow + yellow markings
(4) Then turn right and walk along a small car park. At the T-junction, turn right, parallel to the power lines. At the entrance to a day camp, turn left and pass under the power lines. At the T-junction, follow the street to the right. Continue along a tarmac path in the Notre-Dame National Forest. Go through a forest barrier (sign saying "Bienvenue") and immediately turn left onto Allée Royale.
Red and yellow + green markings
(5) At the crossroads, take the second path on the right (plot no. 6). At the next crossroads (plot no. 16), continue straight ahead. Cross a stream, join a wider path and follow it to the right. Walk past a riding centre on your left. Go through a forest gate and cross the road at the pedestrian crossing at the entrance to Marolles-en-Brie. Go through a forest gate (sign saying "Bienvenue") and continue straight ahead.
Yellow markings
Cross Chemin du Parc aux Boeufs on the left and continue for a few dozen metres.
(6) Directly below a power line, turn right and go through the gate that leads to a green corridor. Follow a stabilised path and ignore the side paths leading to a residential area. Take a footbridge over a street and leave the sports equipment on your left. Stay on the wide, winding stabilised path and ignore the side paths. Walk along the left-hand side of a football pitch, a tennis court and then a gymnasium. Pass a playground on your right and walk along the left-hand side of a fenced-off meadow.
(7) At the corner of the meadow, turn left onto a tarmac path and walk along a wall on your right. Pass a chicane, come out onto a shopping street and follow it to the left. In front of the entrance to the Espace des Buissons, turn right to cross the street at the pedestrian crossing and follow it to the left, passing a bakery on your right. Cross a street and continue straight ahead. At the crossroads (war memorial on the left), turn right and cross the old centre of Marolles-en-Brie. At the crossroads, turn left into Rue Pierre Bezançon. At the next crossroads, continue straight ahead, walk past the town hall on your right and you will come to a crossroads at the foot of the church.
(8) Cross Route de Brie and follow it to the left. At the fork that appears immediately, keep to the right (dead end). After a few metres, at the pedestrian crossing, turn right onto a path and pass under a metal gate. Walk gently downhill and walk along a lawn on your right. At the bottom, turn right, go through a metal barrier and follow a grassy path that leads to the banks of the Réveillon. Walk along the river on your left and leave a vineyard on your right. Go through a chicane that leads to a crossroads (golf course on the left).
(9) Take the first right, a cement path that goes uphill. After about 30 metres, turn left and walk between a hedge on the left and garden fences on the right. Come out onto a narrow street, turn left, pass through a first forest barrier and follow a tarmac path. Pass a second forest barrier and continue to a roundabout (opposite the entrance to the Domaine de Grosbois, an international training centre for trotting horses).
No signposts
(10) Go around the roundabout on the left and take the first left, Avenue Grosbois. At the end of the tarmac road, go through a metal barrier and continue along a gravel path, parallel to a busy road on the right-hand side (N19). Cross a stream, quickly reach an intersection and turn right to take the tunnel under the N19. Walk along the Réveillon on your left, ignore a footbridge over the river and continue straight ahead. Pass under a TGV line and reach a new intersection at the entrance to a tunnel.
(11) Here, you have two options:
- Go directly to point (13) by turning right towards the Bois de la Grange and following a path along the TGV line fence.
- As shown on the map, follow the green link straight ahead towards Yerres and take the tunnel under the Réveillon. At the exit, turn left and continue along the river on your left.
Red and yellow markings
At the first footbridge, turn left and cross the Réveillon. Climb up to reach the Tégéval.
Yellow markings (rare)
(12) Then turn left towards the Bois de la Grange. Follow a stabilised path on the platform of an old railway line that passes (without you noticing) over the tunnel you took earlier.
(13) Ignore a path coming from the right and continue straight ahead towards Bois de la Grange. Cross the street at the pedestrian crossing and continue straight ahead on a cement path. Ignore a path coming from the left and climb up a lawn on the right below. Ignore a staircase on the right and first turn right then left to cross another street at the pedestrian crossing.
Green markings
(14) Descend a metal staircase and follow a gravel path. Further on, cross a tarmac cycle path, continue along the gravel path and climb a metal staircase. Cross a road and descend another metal staircase. Follow a gravel path parallel to a tarmac cycle path on the right and continue straight ahead. Further on, cross a road (D260) and continue opposite, slightly to the right, on the tarmac path (do not continue on the cement footpath).
No markings
(15) After about 30 metres, turn right onto a path that enters the forest (faded red and yellow cross). At the next junction, turn left onto a good path. At a fork, take the wider path on the right and you will immediately come to a crossroads (plot no. 14).
Yellow markings
Then turn right (north-northeast). When you reach the houses, ignore a path on the left and continue straight ahead on a path that quickly becomes surrounded by vegetation. You will come out at a small car park at the entrance to a swimming pool.
(16) Walk a few dozen metres then turn left towards the RER station to cross the street at the pedestrian crossing. Follow the street to the right and cross the N19 in several stages at the entrance to Limeil-Brévannes. Continue straight ahead on Boulevard Léon Révillon. Pass in front of the town hall and, at the traffic lights, cross Rue de Valenton (D33).
Red and yellow + yellow markings (rare)
(1) Follow Rue de Paris in the opposite direction to the outward journey and go downhill. At the bottom, go around the crossroads on the right to cross the N19, then turn left to reach Boissy-Saint-Léger station (S/E).
To return home:
- RER - Line A, towards Paris then Poissy or Cergy.
Visorando Member
Difficult 
Easy 
