The Warmian-Masurian Voivodeship is a province in north-eastern Poland. Its capital and largest city is Olsztyn. The voivodeship has an area of 24,192 km2 (9,341 sq mi) and a population of 1,427,091 (as of 2006). The region closely corresponds to the southern part of the former East Prussia (part of Germany), which was divided between Poland and the Soviet Union in 1945.
The Warmian-Masurian Voivodeship has the largest number of ethnic Ukrainians living in Poland due to forced relocations (such as Operation Vistula) carried out by the Soviet and Polish Communist authorities. (source) Thank you Sylwia!