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The Carnelle Forest from Viarmes

The Carnelle National Forest is a forest located on a hill 25 km north of Paris. Its summit (altitude 210 m) is one of the highest points in the Val d'Oise. The variety of its landscapes makes it one of the most pleasant sites in the region.
This hike follows part of the northern flank of the forest, allowing you to discover some interesting features of the forest and its surroundings.
La Nouvelle Thève through the woods

Loop starting from Baillon (municipality of Asnières sur Oise), near Royaumont Abbey along the Nouvelle Thève through the Bois de Baillon.
Luzarches, hamlets and wash houses

All the treasures of the local heritage: wash houses, bell towers, streams, etc.
Coye Forest and Hérivaux Abbey in Luzarches

A very varied walk north-east of Luzarches: peaceful valleys, beautiful trees in the Forest of Coye and the remains of the former Abbey of Hérivaux, where B. Constant lived (after largely destroying it...)
The walk mainly follows marked paths (PR® at the start, thenGR®1andGR® 655).
Very peaceful despite the proximity of Paris.
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.
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.
Château de la Reine Blanche, Mongresin and Chantilly Forest
A circular walk starting from the Château de la Reine Blanche and the Étangs de Comelles in the Chantilly Forest, passing through Mongresin (Orry-la-Ville) and the barn of the former Comelle Abbey . The Château de la Reine Blanche and the Étangs de Comelles are among the most remarkable sites in the Chantilly Forest.
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.
In the Forêt des Moines

From Château de la Borne Blanche to Abbaye d'Hérivaux, between ponds and forest.
Chambly, Gandicourt, Ronquerolles loop

A 10-kilometre loop to be done on foot starting from Parc Chantemesse in Chambly. There are no major difficulties and the section along the river is very pleasant.
The north-west of the Chantilly Forest

Chantilly is the largest racehorse training centre in Europe. The forest is criss-crossed by numerous galloping tracks that are usable all year round thanks to the quality of the sand.
During this walk, you can appreciate the importance of this activity in the forest itself and in the plain bordering its northern edge.
Beautiful views of the château, the Grandes Écuries and the Canal Saint-Jean add to the charm of the circuit.
Walk in the forests of Chantilly and Pontarmé

A very pleasant hike in a forest area consisting mainly of coppice woodland, which is ideal for game. Encounters with large animals such as wild boar, roe deer, does and stags are therefore quite frequent. Don't hesitate to take your camera with you.
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.
The northern edge of the Isle-Adam national forest

A varied hike: riverside paths, farmland, forest trails, with the added bonus of discovering a megalithic ruin. The rolling hills of the region offer beautiful views of the surrounding countryside.
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.
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.
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 Forts of Écouen and Domont loop trail
A hike starting from Écouen, passing through Piscop and skirting Sarcelles Saint-Brice and Villiers-le-Bel, between the two forts of Écouen and Domont, the Écouen Regional Forest and the Montmorency State Forest, two churches, castles, urban areas, a little farmland and deciduous plantations.
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.
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 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.
Around Saint-Vaast-lès-Mello
A beautiful hike with wooded areas, plains, quarries where stones were extracted for the construction of Notre-Dame de Paris, many ponds, two wash houses, two chapels, the church of Saint-Vaast, the Rivière le Théroin (a tributary of the Oise), and the Flandre stream.
Loop from Aumont-en-Halatte
A fairly easy hike from Aumont-en-Halatte with a slight elevation gain, in the Halatte National Forest, skirting the village of Fleurines. Two beautiful viewpoints along the route, best enjoyed in summer when the weather is warm.