:For villages of the same name, see Piaśnica Mała and Piaśnica Wielka as well as Piaśnica, Puck County.
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The Piaśnica wilderness, where the river begins, is a place of Polish and Jewish martyrology; the second largest site of mass killings of Polish civilians in Pomerania (after Stutthof) during World War II.
Most of the victims were either executed at a nearby mass execution site in Piaśnica or sent to Stutthof concentration camp.