Kemijoki (kĕˈmēyôkē) [key], longest river of Finland, c.345 mi (560 km) long, rising near Sokosti peak, NE Finland. It flows generally SW to Kemijärvi lake, then W into the Gulf of Bothnia at Kemi. With its many tributaries, the Kemijoki drains most of N Finland. It is an important logging route.
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