The Natisone is a river that flows for some time as a border river between Slovenia and Italy, continues in Slovenia and then crosses the border and continues in Eastern Friuli
Friuli is an area of northeastern Italy with its own particular cultural and historical identity. It comprises the major part of the autonomous region Friuli-Venezia Giulia, i.e. the province of Udine, Pordenone, Gorizia, excluding Trieste...

, in north-eastern Italy. It is the main tributary of the Torre and a sub-affluent of the Isonzo.

The Natisone is formed at 415 m above sea level on the border between Friuli and Slovenia
Slovenia , officially the Republic of Slovenia , is a country in Central and Southeastern Europe touching the Alps and bordering the Mediterranean. Slovenia borders Italy to the west, Croatia to the south and east, Hungary to the northeast, and Austria to the north, and also has a small portion of...

 by the confluence of two streams: the Rio Bianco and the Rio Nero which spring from the Punta di Montemaggiore and Gabrovec mountains. Before the confluence with the Torre, it passes through the communes of Pulfero
Pulfero is a comune in the Province of Udine in the Italian region Friuli-Venezia Giulia, located about 60 km northwest of Trieste and about 20 km northeast of Udine, on the border with Slovenia...

 and Cividale del Friuli
Cividale del Friuli
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