The Monte Orsario (Medvedjak in Slovenian) Regional Nature Reserve - established in 1996 with the regional law no. 42 "Norme in materia di parchi e riserve naturali regionali" (Regulation regarding the regional parks and nature reserves) - includes 156 hectares of the territory belonging to the municipality of Monrupino (Repentabor) in the province of Trieste, and it borders with Slovenia in the north. Today, the whole territory of the reserve is included in the SPA IT3341002 "Aree Carsiche della Venezia Giulia" (Karst Areas of Venezia Giulia) and in the SAC IT 3340006 "Carso triestino e goriziano" (Treiste's and Gorizia's Karst region), representing an element of great value. Along with the Monte Lanaro Reserve it represents the Karst upland.