Sanna is a river in Austria

Austria

Austria , officially the Republic of Austria , is a landlocked country of roughly 8.4 million people in Central Europe. It is bordered by the Czech Republic and Germany to the north, Slovakia and Hungary to the east, Slovenia and Italy to the south, and Switzerland and Liechtenstein to the...

 formed near Tobadill

Tobadill

Tobadill is a tiny municipality in the district of Landeck in Tyrol, Austria, located 4 km west of the city of Landeck.The village was first mentioned in documents in 1275 as „tabulat ill“...

 by the confluence of the rivers Rosanna (35 km, from Arlberg

Arlberg

Arlberg is a mountain range or massif between Vorarlberg and Tyrol in Austria.The highest peak is the "Valluga" at . The name Arlberg derives from the tradition of the "Arlenburg," who are said to have once established themselves on the Tyrolean side of the Arlberg passes . Another story derives...

 and Stanzertal valley) and Trisanna (35 km, from Silvretta

Silvretta

The Silvretta Alps are a mountain range of the Central Eastern Alps shared by Tirol, Vorarlberg and Graubünden . The Austrian states of Tirol and Vorarlberg are connected by a pass road . The majority of the peaks are elevated above three thousand metres and are surrounded by glaciers...

 and Paznaun

Paznaun

The Paznaun is a valley in Tyrol, Austria leading south-west from Pians to the Bielerhöhe , a mountain pass at the border of Vorarlberg and Tyrol....

).

The tributary

Tributary

A tributary or affluent is a stream or river that flows into a main stem river or a lake. A tributary does not flow directly into a sea or ocean...

 to the Inn River

Inn River

The Inn is a river in Switzerland, Austria and Germany. It is a right tributary of the Danube and is approximately 500km long. The highest point of its drainage basin is the summit of Piz Bernina, at 4,049 metres.- Geography :...

 is only 8 kilometres (5 mi) long and considered one of the shortest rivers in Europe, with the places Pians

Pians

Pians also refers to seminarians and alumni of St. Pius X Seminary and Sancta Maria Mater et Regina Seminarium.Pians is a municipality in the district of Landeck in Tyrol, Austria and is located 4.30 km west of the city of Landeck. The main source of income is tourism....

, Grins

Grins

Grins is a municipality in the Landeck district and is located 3.70 km west of Landeck as well as 18 km east of Sankt Anton am Arlberg. The village has 10 parts...

 and Landeck

Landeck

Landeck is a city in Tyrol, Austria with approximately 7,633 inhabitants. It is located at an elevation of about 820 m in the west of Tyrol, on the rivers Sanna and Inn...

 situated at its waterfront.

The whitewater

Whitewater

Whitewater is formed in a rapid, when a river's gradient increases enough to disturb its laminar flow and create turbulence, i.e. form a bubbly, or aerated and unstable current; the frothy water appears white...

 river is used for kayaking

Kayaking

Kayaking is the use of a kayak for moving across water. Kayaking and canoeing are also known as paddling. Kayaking is distinguished from canoeing by the sitting position of the paddler and the number of blades on the paddle...

and was the site of the 1996 world championships.