Château de Léry walks

A walk starting from Valmondois towards Ogivaux Castle and Moulin le Roy, then heading towards L’Isle-Adam through the woods. A stroll along the left bank towards the new port of L’Isle-Adam, then a walk around the lake, and continuing along the banks of the Oise via the GR®1 greenway.

Half of the route takes you through the Forest of L'Isle-Adam. This hike from station to station offers other points of interest, including two covered walkways dating from the Neolithic period.

A walk through some woodland, passing through Saint-Leu, Montlignon, Montmorency, Saint-Brice-sous-Forêt and, finally, Écouen. A lovely way to spend a day with friends or family – and why not stop off at a good restaurant in Piscop before finishing the route? 17/02/2026: Route change between (11) and (12) to avoid a road closed to traffic.

La randonnée se déroule d'abord à travers la Forêt de Carnelle, avec un passage à la superbe Allée couverte de la Pierre Turquaise, la plus imposante d'Ile-de-France. On continue en forêt puis à travers champs, pas loin de l'Oise, pour une visite à l'ancienne Abbaye de Royaumont. On termine entre bois, prés, champs et zones résidentielles.

A hike from station to station with the Oise as the guiding thread. You will cross several wooded parks and follow the river for a long time, mostly on a right of way. At the end of the route, the passage through Auvers-sur-Oise is an opportunity to evoke the famous painter Vincent Van Gogh.

A hike from station to station in two stages. In the first stage, you stay at a higher elevation and enjoy beautiful views of the Seine and its valley. In the second stage, you stay closer to the river. The beautiful Saint-Martin Church in Herblay and the important river transport industry in Conflans-Sainte-Honorine add to the charm of this hike.

A circular loop from station to station accessible via line H. Starting from the town of Bouffémont, it takes you into the Montmorency Forest and on to the Château de la Chasse and its pond. Before and after the château, the route follows various forest trails in the shade of century-old trees.

A station-to-station walk, which can also be done as a slightly shorter loop. The route is mainly woodland, using both signposted paths and little-travelled paths in the undergrowth. The Étang du Corra, a protected site, offers an interlude with beautiful views and the chance to spot many birds.

The ninth stage, entirely in the Oise department, of the Grand Tour of Île-de-France on the GR®11, between the stations of Bornel-Belle-Église in the Esches Valley and Cires-lès-Mello in the Thérain Valley. It consists of a crossing of the Pays de Thelle, from west to east, in the south of the department, and always through magnificent varied landscapes, between woods and fields.

A hike from station to station that crosses the entire western part of the Saint-Germain-en-Laye National Forest. A few ancient crosses mark this forest trail. The route ends in Poissy, where you can admire the Notre-Dame Collegiate Church.