Kamen-na-Obi, known until 1933 as Kamen, is a town in Altai Krai, Russia, located on the left bank of the Ob River 208 kilometers northwest of Barnaul, the administrative center of the krai. As of the

Barnaul is the largest city and administrative centre of Altai Krai, Russia, located at the confluence of the Barnaulka and Ob rivers in the West Siberian Plain. As of the 2021 census, its population