Kymi River

Kymi river (Finnish: Kymijoki, Swedish: Kymmene älv) is a river in Finland. It begins from the lake Päijänne, flows through the provinces of Päijät-Häme, Uusimaa and Kymenlaakso and discharges into the Gulf of Finland. River passes the towns of Heinola and Kouvola. City of Kotka is located in the immediate vicinity of the river delta.

Being one of the largest rivers in Southern Finland, Kymi is a major source of hydroelectricity. City of Kotka and towns of Kuusankoski, Myllykoski and Inkeroinen along the river are major centers of pulp and paper industry. Formerly river was extensively used for log floating.

Kymijoki river has 5 mouths. River is divided into two main branches near Kultaankoski rapids in Kotka, about 15 kilometers inland from the Gulf of Finland. Eastern branch is divided into Korkeakoski and Koivukoski branches; Koivukoski branch is again divided into two mouths (Langinkoski and Huumanhaara). Korkeakoski branch has only one rivermouth.

Western branch divides into Ahvenkoski and Klåsarö branches, both having one mouth.

The westernmost Ahvenkoski branch of the river served as a border between Sweden and Russia from 1743 to 1809. The parts of Finland east of the river were later called Old Finland. Old Finland was incorporated in the Grand Duchy of Finland in 1812.