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In page Silesian Voivodeship:

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The current administrative unit of Silesian Voivodeship is just one fraction of the historical Silesia region which is within the borders of today's Poland (there are also fragments of Silesia in the Czech Republic and Germany). Other parts of today's Polish Silesia are administered as the Opole, the Lower Silesian Voivodeships and the Lubusz Voivodeship. On the other hand, a large part of the current administrative unit of the Silesian Voivodeship is not part of historical Silesia (e.g., Częstochowa, Zawiercie, Myszków, Jaworzno, Sosnowiec, Żywiec, Dąbrowa Górnicza, Będzin and east part of Bielsko-Biała, which were historically parts of Lesser Poland).[citation needed]