Natisone

Natisone / Nadiža
The Natisone at Cividale del Friuli
Origin	Punta di Montemaggiore, Julian Prealps
Mouth	Torre River
Basin countries	Italy, Slovenia
Length	50
Source elevation	415 m
Basin area	322 km²

The Natisone (Latin: Natiso; Friulian: Nadison; Slovene: Nadiža) 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, 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 by the confluence of two streams: the Rio Bianco (Slovene: Beli potok) and the Rio Nero (Slovene: Črni potok) which spring from the Punta di Montemaggiore and Gabrovec mountains. Before the confluence with the Torre, it passes through the communes of Pulfero and Cividale del Friuli.

Coordinates: 45°56′43″N 13°21′53″E / 45.9453°N 13.3647°E / 45.9453; 13.3647