The Mahourat marsh, like the Pigeon plain, is part of a type 1 Natural Zone of Ecological, Faunistic and Floristic Interest (ZNIEFF). This is a scientific tool for making an inventory of ecologically sensitive areas. This marsh is listed as a wintering and migratory stopover site for birds. Several other species such as the European cistude (a turtle) and the otter have also taken up residence here.