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The Province of Upper Silesia (; ; Silesian: Górny Ślonsk) was a province of the Free State of Prussia from 1919 to 1945. It was reunited with Lower Silesia as the Province of Silesia between 1938 and 1941. The capital of Upper Silesia was Oppeln (Opole). The province was further divided into two administrative regions (Regierungsbezirke), Kattowitz and Oppeln.