The Sasso Simone and Simoncello Interregional Natural Park is a 4791-hectare territory located in the provinces of Pesaro-Urbino and Rimini, on the border with the Homonymous Tuscan Nature Reserve of the municipality of Sestino (AR), located in the heart of Montefeltro, falls in the municipalities of Carpegna, Frontino, Montecopiolo, Pian di Meleto, Pennabilli and Pietrarubbia.

A natural oasis that covers more than 1,200 hectares and has been recognised by the European Union as being of particular environmental importance. It is structured in two sections and each deals with a particular aspect of the territory of the Marecchia River valley.