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Marais Audomarois Biosphere Reserve, France

The Marais Audomarois biosphere reserve covers some 22 300 hectares in the north of France, including the city of art and history, Saint Omer, and its wetland, a renowned Ramsar site.

Designation date: 2013


Regional network:  EuroMAB

Ecosystem-based network: 




    Surface : 22 539 ha

    • Core area(s): 1 154 ha
    • Buffer zone(s): 3 082 ha 
    • Transition zone(s): 18 303 ha

    Location: 50°44’46’’N - 2°15’42’’E

    Administrative Authorities

    Mr Luc Barbier
    Syndicat mixte du Parc naturel régional des Caps et Marais d’Opal
    Maison du parc, BP 22, 
    62142 Le Wast

    Tel.: N/A

    Adresse: 2, Rue Albert Camus – CS 20079
    62968 LONGUENESSE Cedex

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    Ecological Characteristics

    The Audomarois landscape owes its richness to its particular geography. It is located on an intersection between three natural regions: the coastal plain, the Flanders intérieure and the Artois hills.

    These multifaceted landscapes are host to a wide variety of flora and fauna. The main natural habitats are reedbeds, tall herbs, peaty woods, meadows, ditches and rivers. The many species of flora include aquatic vegetation, such as flowered rush (Butomus umbellatus), Greater Spearwort (Ranunculus lingua) and marsh fern (Thelypteris palustris), as well as underwater and floating vegetation. These habitat types enable many species of birds to breed, feed and rest.

    There are also a number of endangered species in the region, including water hemlock (Cicuta virosa), fluvial Oenanthe (Oenanthe fluviatilis) and Stratiote false aloe (Stratiotes aloides).

    The natural heritage of the reserve is especially remarkable for the abundance and variety of its waterbird communities. Located on major migration routes, the Audomarois marsh provides food and necessary rest for birds such as Sedge Warblers (Acrocephalus schoenobaenus), the Bluethroat (Luscinia svecica), the warbler effarvate (Acrocephalus scirpaceus) and the rare Aquatic Warbler (Acrocephalus paludicola).

    In view of this natural wealth (flora, fauna and landscapes), the Audomarois marsh enjoys several forms of protected status, including inscription as a Natura 2000 Site, a National Nature Reserve, a Regional Natural Reserve and a Regional Natural Park. Since 2008, the wetland has also been recognized as a place of international importance under the Ramsar Convention.

    Socio-Economic Characteristics

    The reserve has a permanent population of 69 000 residents, as well as one of France’s two remaining wetland floating gardens. Since the seventeenth century, market gardening activities have promoted the development and creation of these landscapes, which are still preserved today. The gardens are characterized by a system of wateringues (water management units or small canals) crucial for the prevention and management of floods. The reserve is also a highly valued site for leisure and tourism.




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    Last updated: April 2019