the capital of the department of Bacau, Rumania; situated among the foothills of the Carpathian Mountains, and on the river Bistritza, which enters the river Sereth 5 m. S. Pop. (1900) 16,187, including 7850 Jews. Although of modern growth, Bacau is one of the chief commercial centres in Moldavia, possessing many large timber yards. It is on the main railway from Czernovitz, in Bukovina, to Galatz; and on two branch lines, one of which enters Transylvania through the Ghimesh Pass, while both give access to the salt mines, petroleum wells and forests of the Carpathians.