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Go to the Écuries des Acacias in Marines.
(S/E) Leave the stables, take the PR® on the left, follow the D28 for 600 m. Cross Boulevard de la République and take the Bréançon road for 300 m. You will reach the Silo: a large grain warehouse built in Marines in 1962 and beautifully restored by architect Xavier Prédine-Hug. (The Silo is a private museum open by appointment).
(1) Take the D64 on the left for 300 m until you reach the calvary. Take the road on the left for 300 m. Take the Chemin du Pont on the right for 300 m. Pass the gendarmerie and the ITEP. Take Chemin de la Mare à Gosse on the left for 200 m. Dismount and walk along this path as it is one-way. Cross Rue Joseph Cheron then take the GR® on the right, Rue du Bœuf for 90 m.
(2) Turn left onto the path to reach Rue du Heaulme, PR®: turn right. Continue for 80 m. Take Sentier des Plans for 260 m until you reach the Virgin Mary statue. Take Rue Radegonde on the left for 80 m, then take the Chemin Mort path on the left. Continue for 200 m, then cross Rue de Hautiers.
(3) Take Chemin des Anglais opposite for 460 m. Take Rue du Marechal Foch on the right for 40 m, then Allée des Ponts Hibert on the left for 300 m. Continue straight ahead to rejoin the PR®.
(4) Turn left and join Chemin de Marines in Chavençon, then turn right. Arrive in Neuilly-en-Vexin.
(5) Pass in front of the cemetery, cross Rue du Heaulme, then take the path on the right that runs alongside the D188 and then veers away from it. The path is 900 m long and can be trotted on depending on the condition of the terrain.
(6) Take the PR® on the right. Arrive at Chavençon. Continue to the calvary.
(7) Take the PR® on the right. This path climbs quite steeply. Continue along this path for 1.7 km. Cross Rue des Buttes and head for the assistance point opposite.
(8) Take Rue des Buttes on the left: PR® for 1.4 km. Reach the summit of Les Buttes du Rosne, which,at an altitude of 216 metres, isthe highest point in the Val-d'Oise department and the highest natural point in the Île-de-France region.
(9) Continue on to reach the formerhome of Sarah Bernhardt. Sarah Bernhardt was aFrench actress, painter and sculptor . She is considered one of the most important French actresses ofthe 19th and early20th centuries.
(10) Take the path that descends to the right of Sarah Bernhardt's house. At the first crossroads, take the path on the right. At the second crossroads, take the path on the right and continue straight ahead until you reach the PR®.
(11) Take the PR® on the left: Chemin de Chavençon. Pass in front of Clos Férout: wine estate. Continue to the calvary. Cross the D188, then take the road opposite and pass in front of the Gros Poirier farm.
(12) At the crossroads, take the path on the left. This path is suitable for trotting, depending on the condition of the ground. Slow down to negotiate the bend. Take the path on the right. The path that follows is suitable for trotting on the downhill section and galloping on the uphill section.
(13) Take Rue du Heaulme in Rosnel: PR®, left for 300 m. Take Chemin des Châtaigniers on the right and continue on this path for 1 km.
(14) Take Route de Marines on the left and join the PR® on the right. At the first crossroads, continue on the PR® which branches off to the right. At the second crossroads, continue on the PR® which branches off to the right. At the third crossroads, continue on the PR® to the right. Take the GR®1 on the right, continue for 890 m and at the crossroads turn left and continue to the intersection you passed on the way there.
(2) Continue straight ahead, cross Rue Joseph Cheron and take the path opposite, Chemin de la Mare à Gosse, for 200 m. Take Chemin du Pont on the right for 300 m. Pass in front of the ITEP and the gendarmerie. Take the road on the left for 300 m.
(1) At the cross, take the D64 on the right for 300 metres. Take the Route de Bréançon on the right for 300 metres. Pass the silo again. Cross Boulevard de la République to take the road opposite. Continue on this road for 600 metres to arrive at the Écuries des Acacias (S/E).
