Two interpretation panels were installed in August 2020 in the observatory of Kervarin in Mesquer. The first presents the site of the Rostu marshes and the management method for the properties of the Conservatoire du Littoral. The second illustrates the life of the marsh over the months with a chronological timeline that evokes both the natural cycles (bird migration, flowering etc.) and those of present professional activities, mainly salt production and oyster farming. These panels can be used as educational support during the visits carried out by the CPIE Loire Océane for Cap Atlantique.