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The Marais Poitevin (pronounced [maʁɛ pwatvɛ̃], Poitevin Marsh) is a large area of marshland in western France, a remnant of the former Gulf of Poitou (the name meaning "Poitou's Marsh", "Marsh of Poitou region"). It consists for two thirds of a western zone near the sea called the "dry marsh" (or "dried marsh"), used for farming and breeding, and for one third of an eastern zone called the "wet marsh", a maze of islets criss-crossed by picturesque canals now used for tourist rowboating and nicknamed The Green Venice (la Venise Verte).
With a surface of 970 square kilometres (370 sq mi), it is the largest marsh on the Atlantic coast and the second largest of the whole country (after the Camargue). Extending across three departments (Vendée, Deux-Sèvres, and Charente-Maritime), it is situated west of Niort, north of La Rochelle, and south of Fontenay-le-Comte.
The area was declared a Regional Natural Park (Parc naturel régional) in 1979, but it lost that status in 1997 as intensive agricultural development around the Marsh meant the unique character of the region was endangered, leaving only a core Interregional Park (Parc Interrégional du Marais poitevin) of 185 square kilometres (71 sq mi). Attempts to get back the full Park label started in 2002, leading to a new chart being proposed in 2006; accepted by the local authorities, it was rejected in late 2008 by the government due to a perceived "juridical fragility".
Tourism includes boating in traditional barques, which is a form of punting. There are several piers (embarcadères), from which boats can be hired. The myriad canals are covered in green duckweed (hence the Green Venice nickname) and the drained marsh land is home to a varied fauna.
The Marais Poitevin is also the most important area of angelica cultivation in France.
The marsh sits on limestone plateau, dating from the Jurassic period, which covered much of the former province of Poitou. The Würm glaciation, ca. 24,000–10,000 ybp, caused significant marine regression and the recovery of much river erosion (a watershed of ca. 535,000 ha), thus exposing the marl-limestone formations. Upon such mounds like the villages of Maillezais, Saint-Michel-en-l'Herm and Marans.
- "The Marais Poitevin". Rough Guides. Retrieved 5 September 2017.
- Rushby, Kevin. "Canoeing and cycling in France's Marais Poitevin wetlands". The Guardian. Retrieved 5 September 2017.
- "Marais poitevin". Visit Poitou Charantes. Retrieved 5 September 2017.
- "HISTORY OF THE MARAIS POITEVIN". Archived from the original on 2009-02-17.
- "History of the Marais Poitevin" (from the Pliocene to 1979)
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- (in French) Tourism in the Marais Poitevin
- (in French) Parc naturel régional du Marais Poitevin
- (in French) Organisation for the defence of the Marais Poitevin
- (in French) A guide to punting on the Marais Poitevin (Venise Verte)
- Awarded "EDEN - European Destinations of Excellence" non traditional tourist destination 2010