Terdoppio

Infobox River
river_name = Terdoppio


caption =
origin = Piedmontese Prealps
mouth = Ticino; Po, near Zinasco
basin_countries = Italy
length = 86 km
elevation =
mouth_elevation =
discharge = 3.7 m³/s
watershed = 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 long, with an average discharge of 3,7 m³/s and a drainage basin of c. 515 km².