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Departure from Ponthierry-Pringy station (RER line D).
(S/E) When leaving the station, turn left onto Rue Isidore Leroy. At the end, take the underground passage on the left and continue along Rue Pasteur. Go around the roundabout and take the Pont Maréchal Juin bridge over the Seine. At the end of the bridge, continue straight ahead on the D50 road for about 150 metres (there is a pavement).
(1) Turn left onto the path parallel to the road. At the entrance to the Château de Sainte-Assise and the Accrobranche (on the right-hand side of the road), turn left, go through a forest gate and follow the path heading west-northwest into the woods. You will come to a forest crossroads (six paths).
(2) Take thethird path on the right (north-west). At the first crossroads, continue straight ahead, as well as at the next crossroads (six paths). At the bottom of the descent, you will arrive in front of a fenced-off protected area (information sign). Take the path that runs along the enclosure on the right for about 600 metres.
(3) Do not take the path on the left that passes between two enclosures, but continue straight ahead, keeping to the right and following the second enclosure. At the corner of the enclosure, turn left and continue along the fence. You will arrive at a sewage treatment plant.
(4) Go around the treatment plant on the left. Join a path and follow it to the left. After about 100 metres, turn right and then, at the end of the path, turn left at the intersection to reach the banks of the Seine.
(5) Turn left and follow the river on the left (upstream). Note on the left, some distance away, the ponds visible through the branches.
(6) At the fork, leave the path on the left and continue along the Seine. Ignore all the paths on the left. At the Pont Maréchal Juin bridge, the path turns left to rejoin the D50 road.
Take the bridge on the right to cross the Seine. Follow the same route as on the way there, in reverse, to return to the departure station (S/E).
Visorando member
Moderate 
Difficult 
