Viskan is a river
A river is a natural watercourse, usually freshwater, flowing towards an ocean, a lake, a sea, or another river. In a few cases, a river simply flows into the ground or dries up completely before reaching another body of water. Small rivers may also be called by several other names, including...

 in the south west of Sweden
Sweden , officially the Kingdom of Sweden , is a Nordic country on the Scandinavian Peninsula in Northern Europe. Sweden borders with Norway and Finland and is connected to Denmark by a bridge-tunnel across the Öresund....

. It is about 140 kilometers long. It starts in the lake Tolken
The lake Tolken is the source of the Swedish river Viskan. It is located west of Ulricehamn....

 outside Ulricehamn
Ulricehamn is a locality and the seat of Ulricehamn Municipality, Västra Götaland County, Sweden, with 9,250 inhabitants in 2005.-History:Ulricehamn, originally known as Bogesund has been populated at least since the Middle Ages. The town has had city privileges since at least the 15th century...

 and has its outlet in the Kattegatt. It runs through Borås
Borås is a locality and the seat of Borås Municipality, Västra Götaland County, Sweden. It had 63,441 inhabitants in 2005.- Geography :Borås is located at the point of two crossing railways, among them the railway between Gothenburg and Kalmar, and is often considered the Swedish city gaining the...

. The name means Whisper River.
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