Marais breton

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46°55′28″N 2°03′14″W / 46.924476°N 2.053757°W / 46.924476; -2.053757

The Marais breton (French pronunciation: [maʁɛ bʁətɔ̃], "Breton Marsh"; or Marais breton-vendéen) is a zone géographique humide (humid geographic zone) along France's Atlantic coast. It marks the border between two traditional French provinces, Brittany and Poitou, and extends between two French departments, Loire-Atlantique and Vendée, both of which included in the administrative region of Pays de la Loire.

The Marais breton is protected by levees and dunes, stabilized by the pines of the forest of Pays de Monts. Some areas, such as Bouin are below sea level and were once subject to storm surges. A valve system blocking salt water from entering portions of the marsh was also developed to accommodate the marsh waters to agriculture.