( see also : Expulsion of Poles by Nazi Germany ) Under the terms of the Molotov – Ribbentrop Pact and the German – Soviet Frontier Treaty , the Soviet Union annexed all Polish territory east of the line of the rivers Pisa , Narew , Bug and San , except for the area around Vilnius ( known in Polish as Wilno ) , which was given to Lithuania , and the Suwałki region , which was annexed by Germany . These territories were largely inhabited by Ukrainians and Belarusians , with minorities of Poles and Jews ( for numbers see Curzon Line ) . The total area , including the area given to Lithuania , was 201,000 square kilometres , with a population of 13.2 million . A small strip of land that was a part of Hungary before 1914 was given to Slovakia
Expulsion of Poles by Nazi Germany
Expulsion of Poles by Nazi Germany
History of Poland (1939–1945)