The Kymi (Finnish: Kymijoki, Swedish: Kymmene älv) is a river in Finland.

[1][2][3] Being one of the largest rivers in Southern Finland, the Kymi is a major source of hydroelectricity.

The towns of Kotka, Kuusankoski, Myllykoski and Inkeroinen along the river are major centres of the pulp and paper industry.

It divides into two main branches near the Kultaankoski rapids in Kotka, about 15 kilometres (9 mi) inland of the Gulf of Finland.

The Kymi is very swift: it takes three days for its waters to run from lake Pyhäjärvi to sea.