In 1946 the so-called recovered territories were incorporated into existing Voivodeships or divided into new ones. In Upper Silesia a Silesian-Dąbrowa Voivodeship was established roughly comprising the pre-war Polish Silesian Voivodeship and the Zagłębie Dąbrowskie in the east and of the region of Opole in the west. This Voivodship was divided in 1950 creating distinct Katowice and Opole Voivodeships. The rest of the region was divided between Wrocław Voivodeship and Poznań Voivodeship. In 1950 the Lower Silesian districts of Brzeg and Namysłów from Wrocław Voivodeship were added to the newly formed Opole Voivodeship while the westmost region of Poznań Voivodeship was separated from its main part and formed the Zielona Góra Voivodeship. Because many places did not have agreed Polish names in 1945, a Commission for the Determination of Place Names was formed to find proper Polish names to replace the German names. In many cases the Slavic root of the German name was restituted, in some cases a literal translation of the German name was agreed upon, and in cases where an original Slavic name could not be determined, names were taken the new settlers' former native area. German