Its municipal borders enclose an area of  ranging in elevation from  above sea level. The commune borders Gabiano to the north, Mombello Monferrato to the east, Castelletto Merli and Odalengo Piccolo to the south, and Odalengo Grande and Villamiroglio to the west. The two principal population centres are Valle Cerrina which had a population of 583 at the time of the 2001 census, and Cerrina itself, the historic centre and capoluogo which had a population of 353.
The municipality's geographical extent covers an area that varies in elevation from above sea level. It is bordered by Gabiano to the north, Mombello Monferrato to the east, Castelletto Merli and Odalengo Piccolo to the south, and Odalengo Grande and Villamiroglio to the west. The two main population centers are Valle Cerrina (population 583 in 2001) and Cerrina (the historic center and administrative seat with a population of 353).