Inn (river)
![](/Images/godic/202501/20/Verlaufskarte_Inn_DE1025.png")
![View of the Inn valley. In the right half of the picture is the entrance to the Ziller valley.](/Images/godic/202501/20/W_Inntal1025.JPG")
The Inn (Latin:Aenus; Romansh:En) is a river in Switzerland, Austria and Germany. It is a right tributary of the Danube and is 517 kilometres (321 mi) long. The highest point of its drainage basin is the summit of Piz Bernina, at 4,049 metres (13,284 ft). The Engadine, the valley of the En, is the only Swiss valley from which its waters ends in the Black Sea (via the Danube).