On the East side, the heights decrease and the lowest point can be found on the Siret River valley which crosses the county from North to South down the middle.

Bears, wolves, foxes, wild boars, and squirrels inhabit Bacău County's mountains, particularly in its rural Slănic-Moldova region; the remnants of the local deer are preserved in Mănăstirea Cașin.

Following the collapse of the communist regime, Bacău continued to be the region's most important GDP supplier, but the county became more famous for the controversial figures involved in the local economy than for its performance.

The county was located in the east central part of Greater Romania, in the center of Moldavia.

From a religious point of view, the urban population consisted of 64.9% Eastern Orthodox, 24.4% Jewish, 9.3% Roman Catholic, as well as other minorities.