Best natural monuments around Saint-Leu-La-Forêt are characterized by verdant surroundings, with the Forêt de Montmorency as a significant natural feature. This forest spans 2,200 hectares and features a diverse landscape with altitudes ranging from 94 to 195 meters, including sandy hills and a subsoil of millstone grit and gypsum. The region also offers local parks and traditional pathways, providing opportunities to experience its natural beauty. Chestnuts, oaks, and beeches are common, supporting wildlife such as deer and wild boars.
Last updated: July 3, 2026
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Very nice trail running outing in the forest 🌳
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The fountain is on a small bend, be careful because it is quickly invaded by plants
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What is to be remembered from this route is the passage through the Carnelle forest. However, there are too many roads on the Isle Adam and along the Oise. No particular difficulty.
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pretty lake hidden in the middle of the forest
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High place of pilgrimage (in the region anyway) between the 15th and 18th centuries. The water from this fountain was said to have the power to cure various skin diseases (scabies for example). This pilgrimage ceased shortly before the French Revolution.
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This funerary megalith dates back to the beginning of the Neolithic period! It is the largest and most famous of all the covered alleys in the Paris region, which has become the archetype of burials associated with the Seine-Oise-Marne culture. All the slabs are in Fontainebleau sandstone, several outcrops of which are visible on the hillside.
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This bucolic path runs along the Stors marsh nature reserve. The ground quickly becomes muddy in bad weather and the days following the rain. That said, the setting is beautiful along the rock faces. For the rest, it's a fairly easy single.
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Magnificent natural reserve that this marsh of Stors.
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The region is characterized by the vast Forêt de Montmorency, which features a diverse landscape with altitudes ranging from 94 to 195 meters. You'll find sandy hills and a subsoil composed of millstone grit and gypsum, creating unique terrain. The forest is predominantly covered with chestnuts, oaks, and beeches, and includes picturesque ponds like Godard Pond.
Yes, The Blue Lake of Carnelle is notable for its deep blue color, which comes from its bottom rock, a mixture of gypsum and marl. Additionally, the Auversian Geological Site showcases a unique geological substrate formed from the famous sands of Auvers.
The Saint Radegonde Fountain in the Montmorency forest is a significant historical site, once a pilgrimage destination believed to have healing properties. You can also visit the Covered alley, a funerary megalith dating back to the Neolithic period, which is the largest of its kind in the Paris region.
The dense woodlands of the Forêt de Montmorency provide a habitat for diverse wildlife. Visitors might spot deer, wild boars, foxes, and badgers during their exploration.
Yes, The Blue Lake of Carnelle is considered family-friendly. Within Saint-Leu-La-Forêt itself, Le Charme au Loup and Square Josquin des Près are parks with ponds and recreational playgrounds, ideal for family outings.
The Forêt de Montmorency offers extensive hiking opportunities. The GR1 trail traverses the forest, and the 2.5 km “Chemin du Philosophe” circuit near the Château de la Chasse is popular for its thematic stages. For longer walks, the “Route of the three ponds” starts from Saint-Leu-la-Forêt station. You can find more routes in the MTB Trails around Saint-Leu-La-Forêt guide.
The terrain in the Forêt de Montmorency is varied, with sandy hills and distinct relief. Trails range from easy to intermediate. For example, the path along the Marais de Stors is generally easy, though it can become muddy after rain. Many trails are suitable for various fitness levels.
Yes, a notable circular route is the “Route of the three ponds” which typically takes about 4 hours and 45 minutes to complete, starting from Saint-Leu-la-Forêt station. Other popular loops include the “Plumet Tower – Hunting Castle loop” and the “Pond and Château de la Chasse – Hunting Castle loop.”
Visitors appreciate the diverse natural features, from marshlands like the Marais de Stors to the unique geological sites and historical fountains. The scenic beauty of The Blue Lake of Carnelle and the historical significance of the Saint Radegonde Fountain are frequently highlighted.
Absolutely. The region offers various cycling routes, including options for gravel biking and touring. You can explore routes like the “Godard Pond – Forest Climb Trail loop” or the “Auvers-sur-Oise – Banks of the Oise loop.” More details can be found in the Cycling around Saint-Leu-La-Forêt guide.
The natural monuments, especially the forests and parks, are beautiful year-round. Spring and autumn offer pleasant temperatures and vibrant foliage, while summer is ideal for longer days outdoors. Even in winter, the landscapes have a unique charm, though some paths might be muddy after rain.
The Singletrack along the Marais de Stors is a beautiful path, but be aware that the ground can quickly become muddy in bad weather or after rain. It's advisable to wear appropriate footwear. This classified site is known for its high landscape value and rich flora and fauna.
For detailed information on various walking and hiking trails within the Montmorency Forest, including maps and descriptions, you can visit the local tourism website: tourismesaintleu.fr.


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