 However, in 1930 Sarny county became part of the Volhynian Voivodeship, thus the area shrank to 36 668 square kilometers.Even after this change, it still was the biggest Voivodeship of interwar Poland.Polesie lay in eastern part of the then Polish state, bordering the Soviet Union to the east, Lublin Voivodeship and Białystok Voivodeship (1919–1939) to the west, Nowogródek Voivodeship to the north and the Volhynian Voivodeship to the south.