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Starting point and access: Mortcerf station.
- Transilien - Line P, on the section between Paris-Est and Coulommiers.
Take the only exit, Place de la Gare, on the side of platform 1. If arriving on platform 2, take the footbridge.
Red and white + yellow + mauve + blue markings
(S) With your back to the station, turn right and walk along the car park. At the end, turn left twice and take a stony path. Then follow the path closed to motor vehicles, which goes round a house on the left. Pass a hairpin bend and follow a narrow path, then a wider track through the woodland. Keep a meadow on your right at a distance and ignore a few paths branching off to the left. At a junction, continue straight ahead and, further on, cross a stream. After another narrow passage, pass a hairpin bend and emerge onto a small road.
(1) Follow the road to the left and note an old lime kiln on the right. Pass under the railway viaduct.
Red and white + yellow + purple markings
At a left-hand bend, ignore a path coming from the right and stay on the road. After a sign saying “No vehicles over 3.5 tonnes”, leave the road and turn left onto a farm track. Pass a farm shed on your left, ignore a vague path on the right and head towards the forest.
Yellow markings
(2) At the junction just after an electricity pylon and at the edge of the forest, turn right and stay along the edge. Cross a stream and head uphill on the opposite side through the trees. Ignore a path branching off to the right and continue on level ground inside the forest but close to the edge. Further on, go slightly downhill and arrive at a crossroads (gate on the left).
(3) Continue straight on along a track between a fence on the left and a field on the right. Pass by the foot of an isolated house. Further on, the track gives way to a tarmac road which begins to descend. At the junction, cross the road and follow it uphill to the left, on its right-hand verge (which is wider and better sheltered than the left-hand one).
No signposting
Cross Rue de Bréhal on the left and continue uphill on the main road.
(4) Just before a chicane on the road, turn right onto a discreet path closed to motorbikes and horses (chicane). Soon turn right and follow a fence on your left. At the corner of the fence, turn left. Continue along a path through the undergrowth and further on you’ll come to another fence on your left.
(5) Just before the end of the fence, turn right and head down into the woods. Look for a mountain bike signpost and follow it to the left at the next three-way junction. Note the Chapelle de Tigeaux below on the right. At a three-way junction, veer left on level ground (ignore the path leading down to the right).
Green markings
(6) At the next three-way junction, turn right (mountain bike marker) and follow a dilapidated shed on your right. Head downhill, emerge onto a small car park and walk past a house. At the corner of the house (No. 11), turn left. After no. 14, take a narrow path on the right and follow a fence on your right (the IGN map is inaccurate here, unlike the OSM map). Continue between two fences. Pass a chicane, turn left, and immediately come out onto a street; follow it downhill to the right.
(7) At the T-junction, turn right. At the stop sign, cross the D20 and continue straight ahead into Rue de Rézy (hairpin bend). Take the bridge over the Grand Morin and continue straight on, following an old farmstead on your right. At the corner, ignore the path leading off to the right and continue along the road which climbs in a hairpin bend to the left.
Red and white + yellow + green markings
At the end of the hairpin bend, continue along the road (theGR®®1joins from the right). Take another hairpin bend, to the right.
(8) At the start of a left-hand bend, take a track to the left at an acute angle. Climb slightly further then head north across the cultivated plateau. Pass under a medium-voltage power line and head downhill. Arrive at the village of Serbonne and rejoin the tarmac road. Just before a Stop sign, turn left onto Ruelle à Judas and walk alongside the old buildings. When the street turns left, continue straight on along a path that descends to the banks of the Grand Morin.
Red and white + yellow markings
(9) Then turn right and walk alongside the river on your left. Ignore the first path on the right and take the second one. At the end, follow the road to the left. Pass an old mill and reach the sign marking the exit from Serbonne.
No markings
(10) Then turn right onto Route de Serbonne. Walk for a long while along this quiet little road, keeping the Grand Morin on your left. If you prefer to avoid the tarmac, there is a wide grassy verge between the road and the river. Pass the sign marking the exit for Crécy-la-Chapelle and several houses. The road bends right then left at the entrance to a campsite.
(11) At the traffic lights, turn left onto the small road towards the church. Walk downhill and past the church on your right. At the corner, turn right and walk past the entrance gate. Turn right again, climb a flight of steps and come out onto the D934. Follow the road to the left and cross a river (with a wash house below on the left). Walk along the road (Rue Nationale), which is quite busy. Cross the Chemin du Moulin on the left and continue straight on.
(12) At number 62, leave the road and head left towards the swimming pool car park, either by walking down a small lawn or by taking the access road. Cross the car park to the banks of the Grand Morin. Then turn right and walk along the river on your left. Walk past a football stadium and then its car park. At the end of the car park, turn left to stay by the river (do not take the footbridge).
(13) Turn right and follow a tributary of the Grand Morin. Pass the tennis courts. Cross the road at the pedestrian crossing, continue along the path opposite and briefly follow the signposting (which is of little use here). Follow the river on your left and note the numerous footbridges connecting the path to the houses on the opposite bank.
(14) Further on, ignore the signposts directing you to turn right or left and continue straight ahead along a car park. At the roundabout (belfry on the left, war memorial on the right), turn right towards the station. Cross Rue du Bon Accueil on the right-hand side and immediately turn left onto Avenue de la Gare. You will soon find the station (E) on your right.
To get back home:
- Tram - Line T14 towards Esbly, then change to line P for Paris-Est or Meaux.
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Difficult 
