Nikolayevsk-on-Amur is a town in Khabarovsk Krai, Russia located on the Amur River close to its liman in the Pacific Ocean. Population: 22,75…Nikolayevsk-on-Amur is a town in Khabarovsk Krai, Russia located on the Amur River close to its liman in the Pacific Ocean. Population: 22,752 ; 28,492 ; 36,296.