Kitkajoki or Kitkanjoki is a river of Finland.

It begins from the lake Ala-Kitka that is connected to the lake Yli-Kitka in the municipalities of Posio and Kuusamo in the region of Northern Ostrobothnia and flows then towards Russia joining the river Oulankajoki near the Russian border.

It is a part of the Kovda river system in Russia and Finland from which the waters flow to the White Sea.

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