Białystok is the largest city in northeastern Poland and the capital of the Podlaskie Voivodeship. It is the tenth-largest city in Poland, second in terms of population density, and thirteenth in area. Białystok is located in the Białystok Uplands of the Podlachian Plain on the banks of the Biała River, 200 km (124 mi) northeast of Warsaw. It has historically attracted migrants from elsewhere in Poland and beyond, particularly from Central and Eastern Europe.
https://en.wikipedia.org/wiki/Bia%C5%82ystok