Best natural monuments around Dourdan are primarily centered within the Dourdan National Forest, an expansive area covering over 1,600 hectares. This forest is characterized by two distinct massifs separated by the Orge valley, creating a varied natural landscape. It features diverse tree species, including ancient oaks, and provides a habitat for various wildlife. These sites offer opportunities for nature observation and walks.
Last updated: July 4, 2026
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The 3 cellars of Sermaise constitute the most important Essonne site for the hibernation of chiroptera. Indeed 6 different species of bats have been observed
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Very nice path but sandy in places. It was complicated with 32 tires but it was worth it.
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Sometimes sandy and slippery
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On the Véloscénie, magnificent path leading to just opposite the Barn.
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Here we find a vast sand pit in the middle of the trees. The preserved setting is quite exotic. It's hard to believe that we are a few kilometers from Paris. The opportunity to travel a little bit, without going too far! Take off your hiking boots to enjoy the sand!
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Monstrous! a small bench to meditate and learn humility in the face of the 500-year-old beast
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Very large park managed by the National Forestry Office. Discovery of raptors (with show) and route to see the deer. Food trucks for lunch on site.
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The Dourdan National Forest offers a variety of unique natural features. You can discover the Preserved Sand Quarry, which provides an exotic setting with a vast sand pit amidst trees. The forest is also home to ancient trees, such as the impressive Chêne des six frères, an English oak estimated to be around 500 years old. Additionally, you can find the tranquil Fontaines Bouillantes ponds and the scenic Orge valley.
Yes, the Dourdan National Forest is renowned for its ancient trees. A must-see is the Chêne des six frères (Six Brothers' Oak), located at the southern tip of the forest. This impressive English oak is approximately 500 years old, with a trunk measuring about six meters in circumference, from which six new trunks have grown. It's a truly monstrous and humbling sight.
The Dourdan National Forest is a haven for diverse wildlife. Visitors might encounter big game such as stags, roe deer, and wild boar, as well as smaller mammals like squirrels, badgers, and hedgehogs. The area also hosts around sixty species of birds, including robins, cuckoos, tits, and woodpeckers, making it an excellent spot for nature observation.
Absolutely. You can explore the Preserved Sand Quarry, which features a vast sand pit in the middle of the trees, offering a unique landscape. Another fascinating geological site is The Caves of Sermaise. These three cellars are an important site for the hibernation of chiroptera, with six different species of bats observed there.
The Dourdan National Forest and surrounding areas offer numerous outdoor activities. You can enjoy extensive walks and hikes on well-marked trails. For more specific activities, there are various running trails, mountain biking routes, and road cycling routes available. For example, you can find routes like the 'Preserved Sand Quarry – The famous Nemours crossroads loop' for running or the 'Route aux Cerfs – Remarkable oak loop' for MTB. You can explore these and more on the running, MTB, and road cycling guide pages for Dourdan.
Yes, many natural monuments and areas in Dourdan are suitable for families. The Dourdan National Forest itself provides a 'green getaway' with well-marked trails perfect for family walks. Specific highlights like the Chêne des six frères and the Preserved Sand Quarry are noted as family-friendly. The Rambouillet Wildlife Park, though a bit further, is also an excellent family-friendly option for nature and animal discovery.
The Dourdan National Forest and its natural monuments are beautiful throughout the year, offering different experiences with each season. Spring brings blooming flora and active wildlife, while autumn showcases vibrant foliage. Summer is ideal for longer walks and picnics, and even winter offers a serene, quiet beauty. The Haute Vallée de Chevreuse Natural Park organizes nature walks in the Dourdan forest throughout the year, indicating its year-round appeal.
Yes, the Abbey of L'Ouÿe is a notable historical site located within the Dourdan National Forest, making it an integral part of the natural landscape experience. There's even a 'Circuit of the Abbaye de l'Ouÿe,' a nine-kilometer walking tour through the forest that leads to the abbey, combining natural beauty with historical exploration.
Visitors highly appreciate the unique and preserved settings. For instance, the Preserved Sand Quarry is loved for its 'exotic setting' that makes one feel far from urban life. The Chêne des six frères is often described as 'monstrous' and a 'beautiful place' for meditation. The overall appeal lies in the chance to reconnect with nature, observe diverse wildlife, and enjoy tranquil walks away from city noise.
The Dourdan National Forest is easily accessible, primarily by car, with various parking options near trailheads. While specific public transport details to all natural monuments are not readily available, Dourdan itself is reachable by train, and local transport options may connect to parts of the forest. The forest is well-suited for numerous walks and hikes, with well-marked trails for easy navigation.
Absolutely. The Dourdan National Forest offers several serene locations perfect for nature observation. The Fontaines Bouillantes ('Boiling Fountains' ponds) are a picturesque and tranquil spot, ideal for quiet walks. The Orge valley, which runs through the forest, also provides a 'bucolic setting' where you can enjoy the varied landscape and observe local flora and fauna in peace.


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