sentences:  Located north of the Beskid Mountains, Bielsko-Biała is composed of two former cities on opposite banks of the Biała River, Silesian Bielsko and Lesser Poland's Biała, which merged in 1951.Both city names, Bielsko and Biała refer to the Biała River, with etymology stemming from either "biel" or "biała", which means "white" in Polish.The remnants of a fortified settlement in what is now the Stare Bielsko (Old Bielsko) district of the city were discovered between 1933 and 1938 by a Polish archaeological team.