The Quadrilatero (, for greater specificity often called the "Quadrilateral fortresses") is the traditional name of a defensive system of the Austrian Empire in the Lombardy-Venetia region of Italy, which connected the fortresses of Peschiera, Mantua, Legnago and Verona between the Mincio, the Po, and the Adige Rivers.
The Quadrilatero (also known as the "Quadrilateral fortresses") is a defensive system in the Austrian Empire's Lombardy-Venetia region of Italy, comprising Peschiera, Mantua, Legnago, and Verona fortresses situated along the Mincio, Po, and Adige Rivers.