The Marais Poitevin (, 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).