The Tagliamento is a braided river in north-east Italy, flowing from the Alps to the Adriatic Sea at a point between Trieste and Venice.
The Tagliamento river is considered as the last morphologically intact river in the Alps.
For this reason, it has been the subject of many scientific investigations about its peculiar characteristics, i.e., its 150 km long corridor which connects the Alps and the Adriatic Sea, its unconstrained floodplain, which hosts several aquatic and terrestrial habitats, and its over 600 islands.
The source is in the Mauria Pass, on the border between the regions of Veneto and Friuli-Venezia Giulia. In the upper section, it flows through the historic Carnia region, in the northern part of the province of Udine. In the middle and lower sections, it first sets the boundary between the provinces of Udine and Pordenone and later between the former and the Province of Venice. Finally, it flows into the Gulf of Venice between Lignano Sabbiadoro and Bibione.
The watershed covers an area of 2,916 square kilometres with a population of approximately 165,000. The watershed lies almost entirely in Carnia and the other mountain valleys of Friuli.