Refine your search for walks in Méry-sur-Oise
The Oise Valley of landscape painters

This hike passes through the villages of Auvers-sur-Oise, Valmondois and Butry-sur-Oise, alternating between countryside and the banks of the Oise. All these places have provided numerous subjects for landscape painters, notably Dupré, Daubigny and Pissarro, precursors of the Impressionists. Even today, visitors are struck by the charm of this region in all seasons.
In the Forest of Isle-Adam around the Abbaye du Val

This hike is a shorter version of the hike called "The Isle-Adam National Forest and its southern edge". The route, with sections through the forest and paths across fields and meadows, offers beautiful woodland scenery and sweeping views of the surrounding countryside thanks to the gently rolling terrain.
The mills of Valmondois and the old railway line

A pleasant hike along the Sausseron, a small stream in Valmondois, past the mills and back via the steam tramway museum and its old railway line.
Loop in the Montmorency Forest

Starting from the Route du Faîte, this is a very hilly hike in the Montmorency Forest, passing by the Château de la Chasse.
Around the confluence of the Sausseron and Oise rivers

A very varied hike through green valleys, cultivated plateaus and forests. Some beautiful views of the surrounding countryside and the crossing of villages with interesting architectural heritage make it very enjoyable.
Loop in the north of the Isle-Adam National Forest
Hike in the Isle-Adam National Forest, passing through areas overlooking the Stors Marsh Nature Reserve and the large Abbaye du Val Park with its quarries, caves and Château des Forgets.
The GPX track may be useful.
Short tour of the Isle Adam Forest from Nerville-la-Forêt
From Nerville-la-Forêt, take a short hike in the Forêt de l'Isles Adam with visits to three villages and three churches. This hike is popular in summer when it is hot thanks to the cool shade of the trees in this forest, and also in winter as the ground is not too muddy.
La Croix des Friches and the Forest of La Tour du Lay

The Croix des Friches dates from the Middle Ages and marked the boundary between the communes of Parmain and Nesles-la-Vallée. The beautiful Forêt de la Tour du Lay is home to a Neolithic polishing stone. A hike mainly through woodland, with a few sections between cultivated fields.
Boucle du Puits Fondu and discovery of the Trou à Morts

The circuit starts by taking you along the Sausseron valley, then climbs up the hillside and continues through fields. You return to Nesles via paths through the woods.
The circuit also allows you to discover a unique site called the Trou à Morts.
The Oise River near the Cergy-Neuville Leisure Centre

The Cergy-Neuville Leisure Centre is located in a loop of the Oise River. The hike crosses the centre, giving you an idea of the variety of activities on offer there. It continues along the slopes of the right bank of the river, offering beautiful views of the entire meander. The passage through Port-Cergy, as well as several heritage sites (churches, wash houses, covered walkways, etc.), adds to the interest of the walk.
Château de la Chasse

Short hike with a relatively low elevation gain over 7 km in the Montlignon Forest.
Moderator's addition on 08/03/2021: the description does not seem to be sufficient to follow this route. A GPS or the Visorando app may be useful
The Château de la Chasse

Half-day hike of moderate difficulty from Château de la Chasse to Montlignon.
The Forêt de Montmorency and its Southwest border

A walk in the larger Val d'Oise forest, located only 20 kilometres north of Paris. Chestnut trees are plentiful in this hilly area with ponds and historical sites. A walk to the southwest border will let you discover some interesting features of the local heritage.
De Presles à Luzarches par la Forêt de Carnelle et la Pierre Turquaise

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.
From Achères to Achères via the Forêt de Saint-Germain and the Étang du Corra

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.