Boissy-l'Aillerie walks

Between town and countryside, this walk is mainly marked by yellow PR® markers.

A hike on the slopes of both banks of the Viosne, alternating between cultivated fields, woodland and charming villages. For about 3 kilometres, the route follows the course of an ancient Roman road, the Chaussée Jules César. There is a rich heritage to discover along the way: mills, a castle, churches, crosses, wash houses and beautiful houses.

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.

This route is rich in history and allows you to discover the heritage of Pontoise and its little-known paths.

Alternating between cultivated fields and forest edges, this hike follows the Viosne River. For a little over 2 km, the route follows the route of an ancient Roman road, the Chaussée Jules César.

This circular walk takes you on a journey of discovery through the four vineyards of Jouy-le-Moutier. You will learn about the past activities of this hillside with its old limestone quarries, the former CGB railway line that linked Pontoise to Poissy, the Jouy-le-Moutier menhir and two wash houses.

A circular route for a day's hike. Starting from Sagy, you will pass through Saillancourt, Villette, Condécourt, Longuesse and Vigny.

A short walk, where heritage sites (churches, wash houses, covered walkway) alternate with a path along the Oise river.

The route follows the Avenue Verte (Paris-London cycle route) from Jouy-le-Moutier to Vauréal. After crossing the Oise at the major axis, it returns via the Cergy ponds and the towpath to the Pont de Neuville bridge.

This walk takes you past numerous wash houses fed by springs located on the circular Oise in the municipalities of Jouy-le-Moutier, Vauréal and Cergy. Along the way, you will discover the Jouy-le-Moutier municipal park known as "Parc Raclet", the Rue des Blanchards and its curiosities, the old railway line that linked Pontoise to Poissy, the Axe Majeur, Gérard Philippe's house and the Cergy ponds leisure centre.

A varied hike through woods and fields with two beautiful churches in Bréançon and Le Heaulme. Lovely views over vast fields of green wheat, dotted here and there with red poppies. It's a shame there's a bit too much road.

A loop starting from Vigny via Théméricourt and Avernes.

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.

Pass through beautiful traditional villages, across fields and woods, via the Étang and Moulin de Vallières, ending along the Viosne.

This hike through woods and fields offers beautiful views of the Viosne Valley, a small river that flows through the Vexin Français from north to south, with interesting heritage in the village of Brignancourt and a possible stop at the edge of a beautiful pond.

A circular starting from Maurecourt cemetery, passing through the Berthe Morisot trail, the Château du Fay, the Écancourt farm, the Bois de Jouy and returning to Maurecourt along the old railway line.

A very pleasant walk that begins along the surrounding wall of a castle beautifully set in its grounds. The walk takes you through the hamlet of Héréville with its beautiful houses and charming tranquillity. Although the route ends on a road, it is very quiet and the narrowness of the road forces cars to drive at a speed that makes them very tolerable.

A water-themed hike: from the meanders of the Aubette to the springs that enliven the Vexin region.

Hike around the villages of the French Vexin in the Sausseron valley, discovering castles and manor houses.

A walk that allows you to discover the banks of the Seine at the pace of the barges, first along the water's edge, then from a higher vantage point. You can also discover a rich heritage, such as the royal quarries, the Moorish house of painter and photographer Victor Madeleine (1855-1931) and the River Transport Museum.

Do you enjoy walking? Here is the ideal hike that will take you on a route full of surprises! Between town, countryside and forest, discover Andrésy as you've never seen it before: a town in its natural state!

Narrow paths, steep trails. Explore the picturesque paths and trails of the town of Andrésy. It's a different way to discover the charm of Andrésy, between town, countryside and the banks of the Seine.

A hike from station to station which, with a few climbs, leads from the Seine valley to the Oise valley. After the streets, alleys and paths of Triel-sur-Seine and Chanteloup-les-Vignes, you cross the Hautil Forest in a very pleasant way. Three beautiful churches and two beautiful farmhouses are to be discovered along the way.

A lovely walk along the banks of the Seine, passing through pretty villages such as Evecquemont. The starting point and finishing point are two stations on the same SNCF line.

This is the eighth stage of the Grand Tour de l'Île-de-France on the GR®11, starting from Chars station in the Val d'Oise and heading towards Bornel-Belle-Église station in the Oise, through the north-eastern part of the French Vexin and the borders of the Pays de Thelle. This stage is unique in that it runs along the border between the Val d'Oise and Oise departments, with roughly 50% of the route on each side. The proposed itinerary passes through the Buttes de Rosne, the highest natural point in Île-de-France, although it deviates slightly from the GR® for this.

A pleasant and varied hike in the heart of the French Vexin. The route begins with a circular route north of Chars, between fields, meadows and small woods. After the beautiful church of Chars, there are alternating ascents and descents on the slopes of the south bank of the Viosne. The church and old mill in Brignancourt are a heritage stop before heading up the right bank of the Viosne along the edge of a wetland.

This route to the north of the Forest of Saint-Germain-en-Laye and near Conflans-Sainte-Honorine takes you to the Étang du Corra, a pond with rich biodiversity that is a popular spot for birdwatching. The Pavillon de la Muette is a neoclassical hunting lodge built at the request of Louis XV.

Walk starting from Chars SNCF station passing the Château de Saint-Cyr-sur-Chars. On the way back to Chars there is a narrow pedestrian passage that starts with a staircase.

The walk begins with a very varied section of the GRP® "Impressionist Seine" trail, starting with the imposing ESA Ariane rocket factory and its loading dock, a charming marina, the Val de Seine leisure island, and several large ponds. It continues with Triel-sur-Seine, its pleasant Parc Senet, and its Église St-Martin with its complex architecture. The crossing of the Bois d'Hautil via easy but unspoilt paths is worth the detour for its chestnut forests dotted with a few beautiful oak trees and pierced by a large number of chasms resulting from the collapse of underground quarries. The walk ends peacefully as you admire the confluence of the Oise and the Seine.