The Terdoppio is a river of

Piedmont it, Piemontese , population_note = , population_blank1_title = , population_blank1 = , demographics_type1 = , demographics1_footnotes = , demographics1_title1 = , demographics1_info1 = , demographics1_title2 ...

and Lombardy (northern

Italy Italy ( it, Italia ), officially the Italian Republic, ) or the Republic of Italy, is a country in Southern Europe. It is located in the middle of the Mediterranean Sea, and its territory largely coincides with the homonymous geographical ...

). It starts from the Piedmontese Prealps in the area between

Lake Orta Lake Orta (Italian: ''Lago d’Orta'') is a lake in northern Italy, west of Lake Maggiore. It has been so named since the 16th century, but was previously called Lago di San Giulio, after Saint Julius (4th century), the patron saint of the regi ...

and

Lake Maggiore Lake Maggiore (, ; it, Lago Maggiore ; lmo, label=Western Lombard, Lagh Maggior; pms, Lagh Magior; literally 'Greater Lake') or Verbano (; la, Lacus Verbanus) is a large lake located on the south side of the Alps. It is the second largest l ...

, and then crosses the

province of Novara Novara (It. ''Provincia di Novara'') is a province in the Piedmont region of Italy. Its capital is the city of Novara. In 1992, the new Province of Verbano-Cusio-Ossola was created through the fusion of three geographical areas which had prev ...

. Near Cerano, it splits into two different streams: the first joins the

Ticino River The river Ticino ( , ; lmo, Tesín; French and german: Tessin; la, Ticīnus) is the most important perennial left-bank tributary of the Po. It has given its name to the Swiss canton through which its upper portion flows. It is one of the four ...

, while the second flows through the

Lomellina The Lomellina (Western Lombard: Ümlína/Lümelína) is a geographical and historical area in the Po Valley of northern Italy, located in south-western Lombardy between the Sesia, Po and Ticino rivers. It is one of three areal divisions of the ...

(

province of Pavia The province of Pavia ( it, Provincia di Pavia) is a province in the region of Lombardy in northern Italy; its capital is Pavia. , the province has a population of 548,722 inhabitants and an area of ; the town of Pavia has a population of 72,205. ...

) until it merges with the Po River. The Terdoppio is long, with an average discharge of and a drainage basin of about .

References

Rivers of the Province of Novara Rivers of the Province of Pavia Rivers of Italy {{Italy-river-stub