Ahr

The Ahr is the most important tributary of the Rienz in South Tyrol in northeastern Italy, with a length of about 52.3 km and a catchment area of around 629 km². It flows through the Tauferer Ahrntal.

The Ahr springs from an altitude of about 2500 m below the Birnlücke in the Venediger group. The source area is part of the Rieserferner-Ahrn Nature Park. In its upper course, the Ahr crosses the Ahrntal with significant gradient, where numerous streams from the Zillertal Alps and the Venediger group flow into it. At Sand, it reaches the Tauferer Tal at the Tauferer Boden. Here it takes in its two longest tributaries, the Reinbach and the Mühlwalder Bach. Further along the wide, nearly flat Tauferer Tal, it reaches a last significant tributary, the Mühlbach, from the Rieserferner group. At Bruneck, the Ahr finally enters the Pustertal, where it flows into the Rienz at an altitude of 810 m.

Wikipedia