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The start point is at 15 Rue des Baronnes in Rosny-sur-Seine: car park near the nursery school. You can also park on Rue de la Grande Maison.
Alternative route: see section ‘During the walk or nearby’.
(S/E) On leaving the car park, head back along Rue des Baronnes then turn left into Rue de la Vallée des Prés. Then turn right into Rue de la Grande Maison and cross it to follow the Ru de Bléry. Then turn left into Allée des Lilas (5th and final small bridge).
(1) At the end of this lane, turn right, then cross Rue de Villiers and turn left onto Rue de Lommoye. Cross Rue Roger Salengro; at the next junction, turn right onto Rue Jean Jaurès and pass under the A13 motorway bridge.
(2) At the end of the street, take the path opposite which leads up towards the forest. At the entrance to the forest, continue straight on along Chemin des Mouches (wooden sign) and take the first path on the right towards Clos Brocard (wooden sign).
(3) Follow this path (yellow markings), which, after a flat section, descends steeply to the road (D114). Ignore the paths coming from the right or left. After passing under a high-voltage power line, at the fork, head left (yellow markings).
(4) Cross the road and take the path on the left after the information point. At the fork, turn left. At the next junction, continue straight on, following the valley floor uphill.
(5) Turn right at the edge of the forest. Ignore the path on the right and continue to the Carrefour d’Ivry.
(6) Turn right and go straight on to the Carrefour du Roi.
(7) Then take the first path on the left. Go straight on (north-west), ignoring the first junction (grass path) at forest plots 40A and 41A. At the next junction (Carrefour du Quinconce), turn right, ignore another junction and you will arrive at the Carrefour Marie-Thérèse.
(8) Take the path on the left. At the next junction, take thethird path on the right (north-north-east) and follow the sign for Rolleboise written in yellow on a tree. Near the A13, first turn right then left and cross the bridge.
(9) Immediately after, take the path on the right, which heads east between two fields. Pass under a high-voltage power line and the transformer, then continue straight ahead.
(10) After about 75 m, turn left (forest gate).
(11) About a hundred metres further on, turn right onto a small path that runs alongside the fence of the old forest house. At the end of the path, turn left then go straight on to the gazebo (viewpoint).
(12) At the gazebo, take the path on the left (yellow markings). Zigzag your way through then go straight on to the junction you have already passed.
(11) Continue straight on to the forest gate.
(10) At the junction, turn left, go through a forest gate and continue straight on. At the first fork, after about twenty metres, continue straight on and ignore the path leading down to the left. After about 30 metres, leave the main path by turning left into a meadow. Walk down through it and, after 250 metres, turn right to rejoin the main path (Chemin de la Villeneuve).
(13) Continue straight ahead on Chemin de la Villeneuve. This turns right, between the railway line and the Ru de Bléry. At the junction, turn right to cross the stream and take Rue de la Vallée des Prés. Turn right onto Rue des Baronnes and return to the car park near the nursery school (S/E).
It's usually very quiet during the week! Motorised vehicles are normally prohibited in the forest... but you sometimes come across a few idiots at the weekend...
I was hiking in Rosny Forest on the 7th!
Visorando Member
Very difficult 
Easy 
