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Depart from Bougival station (La Celle-Saint-Cloud) on the Transilien L line (Paris-Saint-Lazare sector).
(S/E) When leaving the station, cross the car park and at the roundabout take thesecond road on the left (Mail du Bois Brûlé). After 50 metres, enter the Bois de Louveciennes forest on the path on the right and then follow the fitness trail to the Étang Sec skatepark.
(1) Take the small road on the right called Chemin de l'Étang, leave the forest and follow the road to the entrance to Parc des Trois Grilles.
(2) Cross the park diagonally and continue along Rue de la Croix-Rouge until you reach a T-junction. Turn left onto Rue des Voisins. Turn right onto Rue Traversière, then left onto Rue de la Princesse, which will take you to the Chemin de la Machine junction.
(3) Turn right, continue along this road, then turn right again to reach the entrance to Parc des Granges du Barry.
(4) Enter on the right. At the Comtesse du Barry music pavilion, the path begins a steep descent, near the conduit that rises from the Seine above the Machine de Marly.
Reach Quai Rennequin-Sualem, turn left and arrive near the Charles X Pavilion, the last vestige of the famous Machine de Marly.
(5) Turn left to reach the pedestrian crossing, where you can safely cross the busy Quai de Conti. Cross the Pont Abbé Pierre and step onto the Île de la Loge just downstream from the Écluses de Bougival.
(6) Follow the only road downstream. At the sports fields after the Emmaüs premises, take the footbridge to leave the island.
(7) Cross the Port Marly footbridge and follow Chemin des Hérons on the right until you reach the roundabout. Take Rue Jean Jaurès opposite, pass under Avenue Simon Vouet and cross Route de Versailles to reach Chemin du Haut des Ormes, which leads to the Centre Hospitalier de l'Europe. Cross the centre to reach the entrance to Château de Monte-Cristo.
(8) Continue along Chemin des Montferrands, which joins the D7. Leave the road after 50 metres to reach the Grandes Terres residential complex. Cross it via a path that climbs up to the school complex. Turn right onto Allée du Mississippi and continue to Parc Jean Witold.
(9) Turn left onto Allée des Épines, then Allée des Vignes and join Rue de l'Abreuvoir at Route de Versailles. Continue down Rue de l'Abreuvoir. You will arrive at Abreuvoir de Marly.
(10) Pass on the left and go up along the D386. Cross the road, taking great care at the entrance to Parc de Marly.
(11) Go up through the Parc du Domaine Royal de Marly to the gate at the museum. On the other side of the roundabout, enter the Square de la Pelouse. After crossing Rue du Maréchal Joffre at the park exit, continue along Chemin de la Chasse du Roi and follow a path leading back to the skatepark in Parc de l'Étang Sec.
(1) Return to the station by following the same route you took on the way there (S/E).
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Difficult 
Easy 
