Some info about POLISH
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GEOGRAPHY - PLACES
The Prosna is a river in central Poland, a tributary of the Warta river .[1] Until 1918, it marked the westernmost border of the Russian Empire. The Towns of Kalisz and Chocz were right on the old frontier. After the proclaimation of the second Polish Republic it marked the Border between Interwar Germany and Poland.[2]
Wikipedia contributors, "Prosna," Wikipedia, The Free Encyclopedia,
ABOUT THE POLISH LANGUAGE