 These included all the territories taken by Prussia in Partitions of Poland which Germany subsequently lost under the 1918 Treaty of Versailles, including the Polish Corridor, Wielkopolska, as well as territories divided after plebiscites such as Upper Silesia, as well as a large area east of these territories, including the city of Łódź.The area of these annexed territories was 94,000 square kilometres and the population was about 10 million, the great majority of whom were Poles.The annexed parts were controlled by a German administration ruled by a Gauleiter, a system similar in practice to that of the Reich itself.