Top 4 Natural Monuments around Lassy
Best natural monuments around Lassy provide a variety of natural and historical sites to explore. The region features a landscape with lakes, forests, and ancient historical monuments. These sites offer opportunities to experience the local environment and its unique geological and historical features. Lassy's natural monuments are well-suited for outdoor activities and discovery.
Best natural monuments around Lassy
- The most popular natural monument is Étangs de Commelles, a lake that is part of the protected Chantilly forest and rich in biodiversity. This site was historically frequented by romantic artists and authors.
- Another must-see spot is The Blue Lake of Carnelle, a forest lake. Its name comes from the bluish color of the water, which is due to the gypsum and marl rock at the bottom of this ancient quarry.
- Visitors also love Covered alley, a historical site. This funerary megalith dates back to the beginning of the Neolithic period and is the largest and most famous of its kind in the Paris region.
- Lassy is known for its diverse natural monuments, including ancient megaliths, serene lakes, and dense forests. These sites showcase both the natural beauty and historical depth of the area.
- The natural monuments around Lassy are appreciated by the komoot community. With more than 150 upvotes and over 60 photos, these spots are well-regarded by explorers.
Last updated: July 2, 2026
The Blue Lake of Carnelle
Highlight • Forest
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Étangs de Commelles
Highlight • Lake
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Covered alley
Highlight • Historical Site
All the slabs are in Fontainebleau sandstone, several outcrops of which are visible on the hillside.
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La Pierre Longue Menhir
Highlight • Monument
Accessible by walking along the wood in the field, it is visible from the field or the woods.
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Carnelle Spring
Highlight • Natural Monument
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Tips from the Community
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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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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The ponds of Commelles are part of the beautiful forest of Chantilly and therefore of the Regional Natural Park Oise-Pays de France It is a protected site, rich in biodiversity, with thousands of frogs in March. In the 19th century, the ponds were frequented by romantic artists and authors such as Chateaubriand.
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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 Blue Lake, like the small pond located a few dozen meters away, has been built in old marl quarries, which give the water a bluish color. For this reason, they reach a depth of 20 to 30 m and swimming is prohibited there for safety reasons. On the other hand, you can go fishing there. The ponds have replaced the quarries, and the presence of green marls, which color their bed, explains their astonishing variation in color. Going from turquoise blue to emerald green, depending on the depth, the time of day, the intensity of the light.
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Be careful, I don't know if it is still drinkable. If someone has the info, please leave a message.
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Frequently Asked Questions
What are some of the most popular natural monuments to visit around Lassy?
Around Lassy, you can explore several captivating natural monuments. The Blue Lake of Carnelle is renowned for its striking deep blue to emerald green waters, a result of gypsum, marl, and algae. Another popular spot is the Étangs de Commelles, a protected site within the Chantilly forest, known for its rich biodiversity and historical appeal to romantic artists.
Are there family-friendly natural monuments near Lassy?
Yes, several natural monuments around Lassy are suitable for families. Both the Blue Lake of Carnelle and the Étangs de Commelles are categorized as family-friendly, offering beautiful natural settings for walks and exploration. Additionally, the Covered alley, a Neolithic funerary megalith, provides an interesting historical element for older children.
What kind of natural features can I expect to see at these monuments?
The natural monuments around Lassy offer diverse features. You'll find beautiful lakes like the Blue Lake of Carnelle and the Étangs de Commelles, often nestled within forests of oaks, beeches, and chestnuts. These areas are rich in biodiversity, with the Étangs de Commelles being particularly noted for its thousands of frogs in March. You can also encounter unique geological formations, such as the gypsum and marl that give the Blue Lake its color, and sandstone megaliths like the La Pierre Longue Menhir.
Are there historical or cultural sites integrated with the natural monuments?
Yes, the region around Lassy blends natural beauty with historical significance. The Étangs de Commelles, for instance, are part of the historic Chantilly forest and were frequented by romantic artists in the 19th century. You can also visit the Covered alley, a significant Neolithic funerary megalith, and the La Pierre Longue Menhir, both ancient historical sites made from local sandstone.
What outdoor activities can I do near the natural monuments around Lassy?
The area around Lassy offers a variety of outdoor activities. You can enjoy cycling on traffic-free routes or road cycling, with guides like Traffic-free bike rides around Lassy and Road Cycling Routes around Lassy. For those who prefer walking, there are numerous running and hiking trails, detailed in guides such as Running Trails around Lassy. Many of these routes pass by or are close to the natural monuments, allowing you to combine your visit with an active outing.
Can I go fishing at any of the natural monuments?
Yes, fishing is permitted at the Blue Lake of Carnelle. While swimming is prohibited due to its depth (20-30 meters) and safety reasons, it's a known spot for fishing.
Are there any natural springs in the Lassy area?
Yes, the Carnelle Spring is a natural monument located in the area. Visitors should note that information regarding its potability may vary, so it's advisable to check local guidance if you plan to drink from it.
What is the best time of year to visit the natural monuments around Lassy?
While specific seasonal tips are not provided for all monuments, spring is particularly vibrant at the Étangs de Commelles, where thousands of frogs can be seen in March. Generally, spring and autumn offer pleasant temperatures for exploring the forests and lakes, with autumn providing beautiful foliage. Summer is also suitable, though it can be warmer.
What kind of wildlife might I encounter near the natural monuments?
The Étangs de Commelles, being a protected site within the Regional Natural Park Oise-Pays de France, is rich in biodiversity. It's particularly known for its large population of frogs, especially in March. The surrounding forests, such as those near the Blue Lake of Carnelle, are home to various forest creatures, birds, and insects typical of the region.
Are there any hidden or less-known natural monuments worth discovering?
While the Blue Lake of Carnelle is well-known, its location hidden in the middle of the forest can give it a sense of discovery. Its unique color variations, from turquoise blue to emerald green, are a beautiful sight. The ancient megaliths like the Covered alley and La Pierre Longue Menhir, though historical, are also natural monuments that offer a glimpse into the region's ancient past and are often found in serene, less-trafficked natural settings.
Most popular attractions around Lassy
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