Koskenkylänjoki ("river of rapid village" literally) or Pernajanjoki starts at Pyhäjärvi of Porlammi in Southern Finland. It runs trough municipalities of Lapinjärvi, Liljendal and Pernaja where it runs to Baltic Sea.
It's length is 38 km and it gathers water from area of 895 km^2.
Volume of water in the river varies from 5 m^3/s (february) to over 20 m^3/s (april)

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