Tour of the Ile-de-France Green Belt

Starting in Pontoise, a city of art and history, this route along the Île-de-France Green Belt crosses the Val-d'Oise and Seine-Saint-Denis departments. The trail reveals a rehabilitated industrial heritage and unexpected departmental parks before opening onto the vast agricultural plains of Seine-et-Marne. The route skirts the borders of the Yonne and Essonne departments, where wooded valleys and waterways like the Yerres and the Orge create preserved bucolic landscapes. Upon reaching the Yvelines department, royal history comes into play through the state forests and the grounds of prestigious châteaux surrounding the capital. This green ribbon forms a vital ecological corridor, alternating between biodiverse wetlands, cereal-growing plateaus, and limestone hillsides. As the kilometers unfold, walkers discover a diverse Île-de-France region, where medieval bell towers stand alongside contemporary architecture.

The Île-de-France Green Belt is a breath of fresh air encircling the Paris metropolitan area within a radius of 10 to 30 kilometers, thus protecting a vital balance between urban development and nature. Conceived in the mid-20th century to contain urban sprawl, it now preserves a mosaic of landscapes ranging from the state-owned forests of Versailles and Saint-Germain-en-Laye to market gardens and agricultural plains. This exceptional natural heritage shelters rich biodiversity, from the wetlands of the Upper Seine Valley to the wooded hillsides of the Marne. The historical heritage is equally impressive, with prestigious castles, abbeys, and old villages that bear witness to the region's rural history. Between regional natural parks and protected areas, the Green Belt is the site of a major ecological restoration, essential for temperature regulation and the quality of life of Île-de-France residents.

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