Ob River  search
BTCommonwealth of Independent States
 .Russian Federation
 ..Ob River
BTAsia
 .Ob River
RTSiberia
 Irtysh River
 Ob-Irtysh Interfluve
SNRises in Altai Mountains and flows NE and N through West Siberian Plain into Gulf of Ob on Kara Sea. Also search Ob. This term has multiple hierarchies.