Réserve naturelle nationale de la dune Marchand, National nature reserve in Bray-Dunes and Zuydcoote, Hauts-de-France, France

Réserve naturelle nationale de la dune Marchand is a protected coastal reserve located between Bray-Dunes and Zuydcoote in northern France. The terrain consists of sandy dunes, wetland areas, and beach sections that form a natural habitat for diverse wildlife populations.

The reserve was officially designated by the French Ministry of Environment in 1974 to protect the coastal dunes of the Flanders region. This formal protection marked an important milestone for nature conservation efforts along France's northern coast.

The reserve lies on the Flanders dunes between Bray-Dunes and Zuydcoote, a short distance from the Belgian border. In 2008 volunteers with the association CONCORDIA, backed by the Nord mammal coordination, sealed former bunkers on the site, turning them into refuges for bats and amphibians. Access is free as long as walkers stay on the marked paths, and the reception point is at the Ferme du Nord in Zuydcoote.

A visitor center in a converted farmhouse provides information and guidance for exploring the reserve. Marked walking trails wind through different landscape sections, making it easy to navigate the natural areas.

The reserve is home to over 300 plant species and nearly 160 vertebrate species, including a substantial bird population. This rich biodiversity makes it an important refuge for rare plants and animals along the European coast.