Kymi River, River system in Päijänne Tavastia, Finland.
The Kymi is a river system in southeastern Finland that flows for about 200 kilometers from Lake Päijänne to the Gulf of Finland, splitting into multiple branches along the way. The waterway features several hydroelectric plants and industrial facilities built on its banks.
The river system held strategic importance in regional history, particularly its western Ahvenkoski branch, which marked the boundary between Sweden and Russia from 1743 to 1809. This border position shaped the territory known as Old Finland during that era.
The river banks house twelve hydroelectric plants and numerous industries, shaping the development of local communities and their connection to water resources.
The river allows fishing and kayaking throughout the year, while frozen sections in winter enable ice sports and activities. Visitors should be aware of the hydroelectric plants and check local conditions based on the season.
Water takes roughly three days to travel from the upper lake to the sea coast, with the deepest points reaching depths of about 30 meters (100 feet) below the surface. This variation in depth and flow speed creates different habitats along the course.
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