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 rivers Rosanna [ceb; cs; da; de; fr; nl; pl; sh; sv] (42 km (26 mi), from Arlberg and the valley Stanzertal [ceb; de; nl; sv]) and Trisanna [ceb; da; de; fr; nl; pl; sv] (31 km (19 mi), from Silvretta and Paznaun).

It flows into the Inn at the small town of Landeck.

The whitewater river is used for kayaking and was the site of the 1996 world championships.

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