70 kilometres (43 mi) in length,[1] it flows south through the municipalities of Enköping, Västerås and Sala.

Its source is Doften, a lake in Heby Municipality.

Historically, the river marked the boundary between the provinces of Uppland and Västmanland (the western boundary of the province of Uppland).

Brooches were discovered in a 9th-century Viking boat burial on the river's Brytilsholmen Island in 1901.

[2][3] This article related to a river in Sweden is a stub.