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Terdoppio Tromello.jpg
The torrente Terdoppio at Tromello
Location within Po watershed
Origin Piedmontese Prealps
Mouth Ticino; Po, near Zinasco
Basin countries Italy
Length 86 km
Avg. discharge 3.7 m³/s
Basin area 515 km²

The Terdoppio is a river of Piedmont and Lombardy (northern Italy). 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 (province of Pavia) until it merges with the Po River.

The Terdoppio is 86 km (53 mi) long, with an average discharge of 3.7 m³/s and a drainage basin of c. 515 km2 (199 sq mi).