Adda

The Adda River, Italian Fiume Adda, is a river in northern Italy's Lombardia (Lombardy) region that flows from tiny lakes in the Rhaetian Alps at 7,660 feet (2,335 m). The Adda runs south from Bormio to Tirano, then west via Sondrio to reach Lake Como towards its northern end after a 194-mile journey (313 km). The upper stream of the river is known as the Valtellina. After leaving Lake Como near Lecco, it flows over the Lombardy Plain, via Lodi, and forms the Milan–Cremona provincial boundary until entering the Po River slightly upstream from Cremona city.

The Adda's drainage basin spans 3,000 square miles (7,800 square kilometers), and the river's average flow in its lower course, which is navigable for 50 miles (80 kilometers), is roughly 8,800 cubic feet (250 cubic meters) per second, varied between 600 and 28,000. The river is heavily used for hydroelectric power generation in the Valtellina as well as irrigation in the Lombardy Plain. The Adda (Addua) was a strategic defense line in several conflicts dating back to the Roman period.

Length: 194 miles