The Sanna is a river of Tyrol, Austria, a left tributary of the Inn.
The Sanna is formed near Tobadill by the confluence of the riversRosanna(42 km (26 mi), from Arlberg and the valley Stanzertal) andTrisanna(31 km (19 mi), from Silvretta and Paznaun). It flows into the Inn at the small town of Landeck. It is 7.1 kilometres (4.4 mi) long. Its basin area is 727 km2 (281 sq mi).[1] The villages Pians and Grins are situated at its waterfront.
The whitewater river is used for kayaking and was the site of the 1996 world championships.[citation needed]