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Northern Italy is a wide cultural, historical and geographical definition, without any administrative usage, used to indicate the northern part of the Italian nation, also referred as ''Settentrione''. It comprises two areas belonging to Italian First level NTUS of the European Union:
* North-West (''Nord-Ovest'') that includes the regions of: Aosta Valley, Liguria, Lombardy and Piedmont
* North-East (''Nord-Est'') that includes the regions of: Emilia-Romagna, Friuli-Venezia Giulia, Trentino-Alto Adige/Südtirol and Veneto
By far the larger portion of Northern Italy is occupied by the basin of the Po river, which comprises the whole of the broad plain extending from the foot of the Apennines to that of the Alps, together with the valleys and slopes on both sides of it. Throughout its whole course indeed, from its source in Monte Viso to its outflow into the Adriatic Sea—a distance of more than 5 degrees of longitude, or 220 miles in a direct line—the Po receives all the waters that flow from the Apennines northwards, and all those that descend from the Alps towards the south, till one comes to the Adige, which, after pursuing a parallel course with the Po for a considerable distance, enters the Adriatic by a separate mouth.
Northern Italy is the most developed and productive area of the country, and the first part of Italy to be industrialized in the last half of the 19th century, the so called ''industrial triangle'' formed by the manufacturing centres of Milan and Turin and the seaport of Genoa. With a 2007 nominal GDP estimated in €834.7 billion, Northern Italy accounts for almost 54% of the national economy.
* Northeast Italy
* Central Italy
* Southern Italy
* Insular Italy