One of the main areas designated for study -by MEMOLA project-, is located on the northwestern region of Sicily and comprises the municipalities of Valderice, Custonaci, San Vito lo Capo, Buseto Palizzolo, Castellammare del Golfo, Alcamo, Vita, Salemi and Calatafimi Segesta.
The northern side of this region is characterized by its massive calcareous reliefs (1110 meters from Monte Sparagio and 1064 meters from Monte Inici), which are irregularly distributed, -emerging abruptly from the sea with their vertical walls.