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Porvoonjoki River, Finnland

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Porvoonjoki (Swedish: Borgå å) is a small river in Finland. The Mediaeval town of Porvoo is situated in the river delta. It is the main river of the Porvoonjoki drainage system, the sources of which are located on the southern slopes of Salpausselkä in Kärkölä, Hollola and Lahti.