The Plains of Castelluccio di Norcia
The Plains of Castelluccio are a karstic and alluvial plateau of the Umbro-Marchigiano Apennines.
Located at about 1,350 m above sea level, there are three Plains that cover an area of 15 km²: the Pian Grande (province of Perugia), the Pian Piccolo (province of Perugia) and the Pian Perduto (province of Macerata, in the Marche Region).
They are marked by karst phenomena, with the formation of karst structures known by local residents as Mergani, which are deep sinkholes in the main plain and drain rainwater into groundwater aquifers, which also bring water to the rivers Sordo and Torbidone, of the plain of Santa Scolastica.
