Best natural monuments around Mareil-En-France are characterized by diverse landscapes within the Pays de France. The village is situated in the Oise-Pays de France Regional Natural Park, an extensive protected area featuring vast forests, valleys, and varied ecosystems. Notable natural features include the Butte Témoin, an isolated hill offering expansive views, and the classified Ysieux Valley. This region provides opportunities to explore geological formations and rich biodiversity.
Last updated: July 2, 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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A 3-meter-high isolated menhir, made of sandstone, with a typical shark's fin shape, suggesting that a part has been broken. Accessible by walking along the wood in the field, it is visible from the field or the woods.
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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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Lac Bleu is one of the two bodies of water in the Carnelle forest. On sunny days, its name takes on its full meaning. But there is another reason for the name of this lake from ancient quarries. The rock at the bottom is a mixture of gypsum and marl. The color is changing due to algae, but originally it is deep blue. Around the lake, one can appreciate oaks, beeches and chestnuts. A feast for the eye!
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The region around Mareil-en-France is rich in diverse natural features. You can explore the geological marvel of the Butte Témoin, an isolated hill offering panoramic views, or immerse yourself in the vast Parc Naturel Régional Oise-Pays de France, known for its forests, valleys, and diverse ecosystems. The village itself is nestled within the classified Ysieux Valley, contributing to the area's natural beauty.
Among the notable natural monuments, you'll find the serene The Blue Lake of Carnelle, known for its striking color and forest surroundings. Another intriguing site is the Saint Radegonde Fountain, a historical natural spring once believed to have healing properties.
Yes, several natural monuments also hold historical significance. The Covered alley is a fascinating funerary megalith dating back to the Neolithic period, representing an important archaeological find. Additionally, the La Pierre Longue Menhir is an ancient standing stone, adding a touch of prehistoric mystery to the landscape.
The Parc Naturel Régional Oise-Pays de France, which encompasses Mareil-en-France, is a haven for wildlife. Visitors can spot a variety of animals including roebuck, foxes, badgers, owls, and bats. The park's diverse environments, from forests to marshes, support a wide array of insects and plant species, making it an excellent spot for nature observation.
Absolutely! The region offers numerous hiking trails. You can find routes ranging from easy to difficult, such as the 'Hérivaux Abbey – Plateau de Thimecourt Fosses loop' or the 'Saint George's Church loop'. For more detailed options, explore the Hiking around Mareil-En-France guide.
Yes, the area is well-suited for cycling and mountain biking. There are traffic-free bike rides and dedicated MTB trails available. Consider routes like the 'Pond and Château de la Chasse loop' or the 'Seigneurie Singletrack loop'. You can find more options in the Traffic-free bike rides around Mareil-En-France guide and the MTB Trails around Mareil-En-France guide.
Yes, several natural monuments are suitable for families. The Blue Lake of Carnelle is a beautiful spot for a family outing, and the Covered alley offers an educational historical experience. The broader Parc Naturel Régional Oise-Pays de France provides ample space for relaxation and exploring diverse ecosystems with children.
The natural monuments and the Parc Naturel Régional Oise-Pays de France are beautiful year-round. Spring and autumn offer pleasant temperatures and vibrant colors, ideal for hiking and exploring. Summer is great for longer days outdoors, while winter can provide a unique, tranquil experience, especially in the forests.
While specific parking details for each individual monument may vary, areas like the Butte Témoin have designated viewpoints near the village cemetery, suggesting accessibility. For the broader Parc Naturel Régional Oise-Pays de France, various entry points and trailheads typically offer parking facilities. It's advisable to check local signage upon arrival.
The Blue Lake of Carnelle gets its name from the ancient marl quarries it occupies. The mixture of gypsum and marl rock at its bottom, combined with algae, gives the water a striking bluish-green hue that changes with depth and light. It's a truly picturesque spot hidden within the Carnelle forest.
The Butte Témoin is a significant geological formation that offers breathtaking panoramic views. From its summit, you can enjoy expansive vistas of the Pays de France, the dense Carnelle and Chantilly forests, and even catch glimpses of Paris on clear days. It's a testament to the region's geological history and a prime spot for scenic observation.


Extend your search for the best caves by checking out these guides of the top ones around Mareil-En-France: