The Top 5 Natural Monuments around Poissy
Poissy’s landscape is a beautiful place to explore — something that you can best experience by visiting one of our 5
beautiful natural monuments around Poissy. To help you find the one for, you can see all the details you need to explore the best natural monuments, and better plan your next outdoor adventure!
beautiful natural monuments around Poissy. To help you find the one for, you can see all the details you need to explore the best natural monuments, and better plan your next outdoor adventure!
Last updated: November 12, 2025
Hautil Oak
Highlight • Natural Monument
This remarkable oak, 95cm in diameter, was around 150 years old when it was felled by the storm of 1999. This windthrow was preserved by the managers. (source Val d’Oise Natural Space Department)
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Chemin du Désert de Retz
Highlight • Historical Site
Path along the Golf de Joyenval and the Désert de Retz, a place famous for its atypical architecture. The garden can be visited every Saturday from April to October, the price of the visit being 10 euros.
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Pond and Fountain at Parc de la Châtaigneraie
Highlight • Lake
Magnificent little park with its cave and its ducks.
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Flambertins Toad Pond
Highlight • Lake
A must-have when the toads wake up from their slumber all at once. It's an incredible song around this pond, we hear more than that. Gorgeous
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Large Sinkhole in Parc Naturel Régional du Vexin Français
Highlight • Natural Monument
There are huge sinkholes in this forest!!! Yes, these ponds are collapses filled with water!!
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