Nizhnevartovsk (Russian:Нижневартовск;IPA:[nʲɪʐnʲɪˈvartəfsk]) is the second largest city in Khanty-Mansi Autonomous Okrug, Russia, located along the right bank of the Ob River. Population: 251,694 (2010 Census); 239,044 (2002 Census); 241,457(**** Census).