Hallingdalselva

Hallingdalselva is a river in Norway. It flows through the Hallingdal valley in Viken county. The river is part of the Drammensvassdraget river system, which ultimately drains into the Oslofjord. The source of Hallingdalselva is typically considered to be Ustedalsfjorden, a lake near Geilo. From there, it flows eastward, passing through several municipalities including Hol, Ål, Nes, and Flå.

The river is characterized by its relatively rapid flow and is known for its scenic beauty. It carves its way through the landscape, creating valleys and supporting various forms of vegetation. Along its course, several smaller rivers and streams contribute to its volume. The hydropower potential of Hallingdalselva has been harnessed, with several power stations located along its length. These facilities play a role in Norway's energy production.

The river also has ecological significance, supporting fish populations and serving as a habitat for other wildlife. Recreational activities such as fishing and kayaking are practiced on and along the river, though access and conditions can vary. Hallingdalselva is an integral part of the natural and cultural landscape of the Hallingdal region.