Petrovsk-Zabaykalsky is a town and the administrative center of Petrovsk-Zabaykalsky District of Zabaykalsky Krai, Russia, located along the B…Petrovsk-Zabaykalsky is a town and the administrative center of Petrovsk-Zabaykalsky District of Zabaykalsky Krai, Russia, located along the Balyaga River in the valley between Zagan-Daban and Zagorinsky mountain ranges, 413 kilometers southwest of Chita. Population: 18,549 ; 21,164 ; 28,291.