The Site consist of an extensive complex of marshes and associated floodplains converging at a coastal bay. Vegetation consists of converted and unconverted wet grassland and the largest peatlands in France. The area is extremely important for breeding, staging and wintering numerous species of waterbirds such as the vulnerable aquatic warbler (Acrocephalus paludicola). It provides habitat for a variety of passerines and various species of notable plants. Human activities include pastoralism, hunting and fishing. As agriculture declines, natural succession will occur, ultimately replacing plant and animal species of great conservation importance with woodland species. The principal aim of the park is to maintain extensive agricultural practices to preserve the marsh habitat.