The Terdoppio is a river of Piedmont and Lombardy . It starts from the Piedmontese Prealps in the area between Lake Orta and Lake Maggiore, and then crosses the province of Novara. Near Cerano, it splits into two different streams: the first joins the Ticino River, while the second flows through the Lomellina until it merges with the Po River.
The Terdoppio is 86 kilometres long, with an average discharge of 3.7 cubic metres per second and a drainage basin of about 515 square kilometres .
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