Upper Silesia (Czech: Horni Slezsko; German: Oberschlesien; Latin: Silesia Superior; Polish: Gorny Slask; Silesian: Gurny Slunsk) is the southeastern part of the historical and geographical region of Silesia; Lower Silesia is to the northwest. Since the 9th century, Upper Silesia has been part of (chronologically) Greater Moravia, Bohemia, Poland, Holy Roman Empire, Austria, Prussia, and later of unified German Reich. It is currently split between Poland (Opole and Silesian Voivodeships) and the Czech Republic (Czech Silesia, or the Silesian-Moravian Region).

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