The Marais Poitevin or Poitevin Marsh is a large area of marshland in western France. The name means "Poitou's Marsh" or the "Marsh of the Poitou region".
It is a remnant of what was the former Gulf of Poitou. The western zone near the sea is called the "dry marsh". It is used for farming and livestock breeding. The eastern zone, called the "wet marsh", is a maze of islets crisscrossed by picturesque canals, primarily now a tourist destination for boating. It is nicknamed The Green Venice.