Otra
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The Otra river is the largest river in the Sørlandet region of Norway. It flows from the Setesdalsheiene in Bykle municipality in Aust-Agder in the north down to the municipality of Kristiansand in the south.
The Otra is 245 km long, making it Norway’s eighth longest river. There are two large lakes along the river: Åraksfjorden and Byglandsfjorden.