The Kajaani, Finnish: Kajaaninjoki; Swedish: Kajana älv, is a river in the region of Kainuu, Finland.

From there the waters flow through the Oulujoki river into the Gulf of Bothnia.

The river drains a chain of lakes that originates in the municipalities of Kuhmo and Sotkamo in Kainuu (Finnish: Sotkamon reitti).

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