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Silesia (English pronunciation [], ; ; ; ; Silesian: Ślónsk) is a historical region in central Europe. Most of it is now within the borders of Poland, with small parts in the Czech Republic and Germany. Silesia is located along the upper and middle Oder River, upper Vistula River, and along the Sudetes, Carpathian (Silesian Beskids) mountain range. The largest cities of Silesia are Wrocław and Katowice.