There is a marshland called the Poitevin Marsh ( French `` Marais Poitevin '' ) on the Gulf of Poitou , on the west coast of France , just north of La Rochelle and west of Niort .
There is a marshland called the Poitevin Mar on the Gulf of Poitou , on the west coast of France , just north of La Rochelle and west of Niort .