Bacău is the main city in Bacău County, Romania. With a population of 136,087 (as of 2021 census), Bacău is the 14th largest city in Romania. The city is situated in the historical region of Moldavia, at the foothills of the Carpathian Mountains, and on the Bistrița River (which meets the Siret River about 8 km to the south of Bacău). The Ghimeș Pass links Bacău to the region of Transylvania.