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Start at Place de la Mairie in Jouy-Mauvoisin (accessible from exit 13 "Mantes-Ouest" on the A13 motorway). There are three parking options:
- In the small car park opposite the school and along the small cemetery next to the church (7 spaces available).
- In the adjacent streets.
- In the large car park of the village hall (on the left just before the church when coming from Mantes on the D110).
No signposts
(S/E) Follow Rue de la Fontaine, pass the town hall and ignore Rue des Cornouillers on your right (this will be the way back). Continue along Rue de la Fontaine, ignoring two small streets on the left. At a three-way junction (no. 23 opposite), turn right, staying on the same street. Pass a wash house on the left and you will come to the fountain at the bottom.
(1) Leave the fountain on your right and go up opposite via Chemin de la Croix Saint-Nicolas. At the fork, turn left and continue uphill. At the next crossroads, continue straight ahead (west-northwest) on a farm track. When you reach an isolated house, continue in the same direction and pass a yellow sign with two sides. Walk about 100 metres through the Bois des Tuileries (a small section of the Rosny Forest; sign) and ignore a path on the right.
(2) At the edge of the woods, head west, slightly downhill between the fields. Stay on the edge of the woods on your right and ignore the perpendicular paths. After passing between the fields again, you will come to a crossroads (stunted hedge on the left).
Red and white markings (rare and faded)
(3) Turn left onto a grassy path, follow the hedge on your right (look for a signpost) and climb up towards a large building. Ignore the path leading off to the left into the fields, follow the wall of the property on your left and descend to the Church of Saint-Martin. Finish the steep descent on the tarmac road. At the corner of the cemetery, cross a small road and go up opposite on a path between the fields. At the end, follow the path on the left for about 50 metres with a hedge of trees on your right.
No signposts
Although you are supposed to follow theGR®26to Apremont, there are no markings except at the very beginning and end of this section (as of February 2017).
(4) At the crossroads, turn right and walk along a farm on your right. At the end of the buildings, continue straight ahead on a grassy path downhill and walk along horse pastures on your left. Turn right at the same time as the path, keep a hedge on your right and continue downhill. At a fork, turn right and continue on flat ground at the edge of a fenced wood. Head northwest towards the bottom of Ravin Gabelle (chalky field on the left), enter the undergrowth and pass under the railway bridge. Then descend through the undergrowth and along the edge of the field on your right.
(5) At the T-junction (sign saying "Interdit aux véhicules à moteur" [No motor vehicles]), turn right and go up a stony path. Then walk along the flat or slightly downhill, along the edge of the woods and then below the railway line (on the right-hand side). Follow a hedge of trees on your left and, at the end of it, note the Manoir d'Apremont some distance below on your left. Go through a forest gate, turn left onto a road and immediately turn right into Rue de Beauvoyer (ignore the red and white signpost indicating to turn left into Rue du Petit Clos).
Red and white signposting
(6) At the three-way junction, follow Chemin des Beurons to the right and climb into the forest. Pass the foot of a transmitter on the right and arrive at a crossroads at Pont du Beauvoyer.
Yellow signposts
Leave theGR® trail opposite and take the bridge over the railway line on the right. Continue uphill, pass a forest barrier and then a sign for "Forêt de Rosny". At a fork, take the right-hand path (east), which is flat.
Red and white markings
(7) At the next crossroads (signpost), go a few metres to the right until you reach the Chêne Mademoiselle (information sign). Retrace your steps.
(7) Continue west (right when coming from the oak tree) towards the ruins of Beuron. At the intersection with a path coming from the right, find the access to the ruins of the Château des Beurons on the left (large clearing, information signs).
Yellow markings + yellow signs
(8) Follow the botanical trail on the right, marked with signs indicating the names of certain trees and other plants. The trail forms a counterclockwise loop, partly in the undergrowth and partly in the clearing (indicative route on the map). North of the ruins, ignore a path that descends to the right but note the viewpoint between the trees over the Seine Valley.
Red and white markings
(8) At the edge of the clearing, turn left (east) onto Chemin des Allées des Beurons à Mantes towards Jouy-Mauvoisin (sign). Stay on the main path, which is marked, and ignore all side paths. Towards the end, the path becomes narrower and more winding and is called Chemin des Fourneaux. At a fork (information sign with map), turn right, go through a forest gate, leave the forest and go up a field path with a hedge on your left. At the end of this path (view of the Seine Valley on your left), ignore a path on the left and continue east-southeast on a farm track.
No signposts
(9) At the crossroads, take the second path on the right, the Sente des Ruelles (chicane), and walk alongside the houses on your right. When you reach the tarmac, look for the Sente des Petits Noyers on your left and go down this steep path (not shown on the map). You will come out onto Rue des Bertins. Cross Rue de la Vallée and go up Rue des Cornouillers (dead end). At the top, go around a large building on the right and continue along Rue des Cornouillers. At the end, turn left and you will immediately come back to Place de la Mairie (S/E).
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