Réserve naturelle nationale des dunes et marais d'Hourtin, National nature reserve in Hourtin, France.

The Réserve naturelle nationale des dunes et marais d'Hourtin is a protected area along the coast that combines beaches, dunes, wetlands, and forests in one landscape. The terrain transitions gradually from sandy shores through vegetated dunes to marshes and wooded areas further inland.

The area received official protection in 2009 when the French government established it as a nature reserve to safeguard the region's natural habitats. This decision arose from collaboration between government authorities and forest management agencies.

The reserve's name comes from the Hourtin dunes and marshes it protects, and its trails let visitors pass from beach and dune grassland to the palus wetlands. The Molua palus is a spawning ground for northern pike and a wintering site for migratory birds such as the greylag goose.

The reserve has several walking trails that start from different points such as Hourtin beach, Contaut, and Piqueyrot. Entry is free and the paths are accessible year-round for visitors.

The Molua palus, a marsh within the reserve, is a spawning ground for northern pike, and its position makes it a wintering site for migratory birds such as the Eurasian teal and greylag goose. Montagu's harrier nests there. Nine plant species in the reserve are protected at national level.