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Koitajoki (or the Koita River) (Russian: Койтайоки) is a river in Eastern Finland and partly in Russia in Northern Europe. Having its origin just by the international boundary in Ilomantsi of Northern Karelia in Finland, the Koitajoki River enters the territory of the Republic of Karelia in Russia, to return to Finland some 30 kilometres (19 mi) further south. It then flows northwest through the Petkeljärvi National Park and the Kesonsuo bog area, and further downstream receives the outflow from Lake Koitere. The main part of the waters are then directed through an underground tunnel of the 84-megawatt Pamilo hydroelectric power plant, which bypasses some 20 kilometres (12 mi) of the natural course of the lowest part of the river.
Map of Koitajoki, Finland
Koitajoki is a tributary of Pielisjoki that flows from the lake Pielinen into Lake Pyhäselkä in Northern Karelia, Finland. It is part of the Vuoksi River basin in Finland and Russia, which flows through Lake Ladoga in Russia and further through the Neva River into the Gulf of Finland.