National audienceThis paper proposes some thoughts on the stakes of opening to the visiting public natural siteswith particular reference to coastal dunes.Although most natural sites readily admit the public in France, their success with the visitorscreates a fear of inherent damages. Then we have to consider stakes of managing these sites.The protection of the biodiversity for future generations is certainly one of them, but the bestinterests of Humanity as a whole cannot only be translated into terms of biodiversity which isonly one of several factors of good husbandry concerned by the protection of our sharedheritage of nature. The access accorded to the public, as a function of the nature of the sites,well informed, marshalled, can also...