Adda (ädˈdä) [key], river, 194 mi (312 km) long, rising in the Rhaetian Alps, N Italy, and flowing SW through Lake Como, then S into the Po River near Cremona. Its upper course furnishes much electric power; the lower river irrigates the Lombard plain. Many battles have been fought along its course, notably the Battle of Lodi (1796).
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