Property for a small part of the commune of Vassieux en Vercors, for the most part the department of Drôme since 1954, the departmental domain of Font d'Urle is a sensitive natural space. Its vocation is the protection of nature and the reception of the public. Some rules of common sense make it possible to protect this space as well as to cohabit in good understanding with the shepherds and their flocks. Picking flowers that are particularly spectacular in May and June is prohibited. Dogs, even on a leash, are prohibited during the summer season (May to October). In the middle of the mountain pastures, there are herds of horses in semi-freedom. In this vast steppe of altitude, stretch of grass and rocks "with for all border the sky" (Joseph Kessel), one would think oneself in Mongolia.