The arboretum at La Roche-Guyon (95), an open garden featuring plant species from the Ile-de-France region.

Set in the heart of a 350-hectare forest - the forest of La Roche-Guyon - the eponymous arboretum was designed to represent the Île-de-France region, both in terms of its shape, which from the air represents each département, and in terms of the flora it contains.

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Discover the flora of the Ile-de-France region, with plane trees in Paris, lime and bay trees in Hauts-de-Seine, cherry and red currant trees in Seine-Saint-Denis.... Or stroll among maples (Essonne), beeches (Yvelines), hornbeams (Val-de-Marne), etc. The department with the most plant species is certainly Seine-et-Marne, which alone covers half the surface area of the region, and is home to numerous species of oak, dogwood, holly, yew, eucalyptus...

Château de la Roche Guyon, a troglodyte castle in the Val-d'Oise with a breathtaking view over the Seine valley
Have you heard of Ile-de-France's only troglodyte castle, nestled in the only village in the region to be named one of France's most beautiful villages? We'll take you on a tour of the Château de la Roche Guyon, an unusual castle in the Val-d'Oise, with an eventful past that also inspired the adventures of Blake and Mortimer. [Read more]

The arboretum is open and accessible every day of the year, so getting there by car is almost essential, especially from Paris. You can picnic on site, provided you don't leave any garbage behind! Alternatively, you can come on foot, via the GR2 from Mantes-la-Jolie. During your visit, continue your stroll to the Château de la Roche-Guyon, a medieval edifice carved out of stone, or to the pretty village center, with its particularly famous vegetable garden .