English summary: After the Second World War, the German region of East Brandenburg became the Polish region of Ziemia Lubuska. In her study, Kerstin Hinrichsen examines how this region was politically constructed after 1945 and turned into a part of Poland over the course of the ensuing decades. She analyses the changing territorial markings, the genesis and shifts in meaning of the term -Ziemia Lubuska- whilst exploring the laboriously established regional institutions. The region's construction embodies a process of regional formation not yet completed to date and one that exemplarily...