Biysk is a city in Altai Krai, Russia, located on the Biya River not far from its confluence with the Katun River. It is the second largest city of th…Biysk is a city in Altai Krai, Russia, located on the Biya River not far from its confluence with the Katun River. It is the second largest city of the krai. Population: 183,852 ; 210,115 ; 218,562 ; 233,238.