Quadrilatero

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What Wikipedia says

The Quadrilatero (English: Quadrilateral, 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.

Excerpt from the Wikipedia article “Quadrilatero”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Sacranon, Public domain, via Wikimedia Commons.