Sagån

The Sagån is a river in Sweden. in length, it flows south through the municipalities of Enköping, Västerås and Sala. Its source is Doften, a lake in Heby Municipality. It flows south into Mälaren, Svealand, the third-largest freshwater lake in Sweden. Its tributaries are Lillån, Isätrabäcken and Lillån.
Historically, the river marked the boundary between the provinces of Uppland and Västmanland.
Norrby Church, which stands immediately to the east of Sala, stands on the eastern banks of the river.
Brooches were discovered in a 9th-century Viking boat burial on the river's Brytilsholmen Island in 1901.