Location of the river mouth
|Other name(s)||Torridalselva, Torridalselven|
|Municipalities||Bykle, Valle, Bygland, Evje og Hornnes, Iveland, Vennesla, Kristiansand|
|Main source||Setesdalsheiene, Bykle, Norway
896 metres (2,940 ft)
|River mouth||Skagerrak, Kristiansand, Norway
0 metres (0 ft)
|Basin size||3,752 km2 (1,449 sq mi)|
|Length||245 km (152 mi)|
The Otra is the largest river in the Sørlandet region of Norway. It begins in the Setesdalsheiene mountains at the lake Breidvatnet in Bykle municipality in Aust-Agder county, just south of the border with Vinje municipality in Telemark county. The river then flows south through Bykle, Valle, Bygland, Evje og Hornnes, and Iveland municipalities in Aust-Agder before passing into Vest-Agder county and flowing through Vennesla and Kristiansand municipalities. The river empties into the Skagerrak in the center of the city of Kristiansand on the southern coast of Norway.
The Otra is 245 kilometres (152 mi) long, making it Norway's eighth-longest river in Norway. There are many large lakes along the river including: Åraksfjorden, Byglandsfjorden, Hartevatnet, and Kilefjorden. There are 12 hydroelectric power plants built along the river, which produce much of the electricity for the southern part of Norway.
The salmon do well in the Otra river because the water is not too acidic. The calcareous rocks in the catchment area at the northern end of the Setesdal valley give the water a certain buffer capacity against acidification.
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