The 165-kilometre (103 mi) long river runs through Rendalen and Åmot municipalities in Innlandet county.

Kjøllsæter Bridge connects the east and west side of the river.

[1] The Rena watershed has a drainage area of 3,967 square kilometres (1,532 sq mi).

[1] A tunnel has been built to transport part of the water from the upper Glomma river into the Rena river in order to optimize the production of electricity by nearby power plants.

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