The oblast is bordered by Poland to the south, Lithuania to the north and east, and the Baltic Sea to the west. It is impossible to travel overland between the oblast and Russia without passing through at least two other countries. The territory was formerly the northern part of the Prussian province of East Prussia, the southern part of which is today part of the Warmian-Masurian Voivodeship in Poland. With the defeat of Nazi Germany in 1945 in the Second World War, the territory was annexed as part of the Russian SFSR by the Soviet Union. Following the post-war migration and flight and expulsion of Germans, the territory was populated with citizens from the Soviet Union. As of the 2010 census, only a small number of ethnic Germans remain; most of the several thousand who live in the oblast are recent immigrants from other parts of the former Soviet Union.