CENB wishes to acquire a set of plots for the preservation of biodiversity and water quality, and to ensure the long-term protection of habitats and species present. These plots are located in the communes of Mézilles (89), Saint-Sauveur-en-Puisaye (89), Treigny-Perreuse-Sainte-Colombe (89); Vénizy (89) and Montsauche-les-Settons (58). In addition, some plots are adjacent to sites already belonging to the Conservatory. Their acquisition will make it possible to obtain a more coherent management of the sectors concerned.