What is Ob (river)?
[[File:Barnaul - Ob.JPG|thumb|right|the Ob near Barnaul]] [[File:Ob watershed.png|thumb|right|The [[watershed]] of the Ob, shown in yellow]] The '''Ob''' is a [[river]] in [[Siberia]]. Together with the [[Lena River|Lena]] and the [[Yenisei]], it is one of the most important rivers of Siberia. Depending upon how its length is measured, it can be between 3.650 km and 6.210 km long. Some important cities on the banks of the river include [[Novosibirsk]] (Russia's third largest city), [[Barnaul]], Kolpashevo, Nizhnevartovsk, Surgut, Khanty-Mansiysk, Beryozovo, Labytnangi, and Salekhard. The Irtysh is the Ob river's main [[tributary]]. Other tributaries include the Omsk, Parabel, Chaya, Tobol and Ishim. The Gulf of Ob is the world's longest estuary. ==Names== The name Ob is based on the Russian name of ''Обь''. The Ob is known to the [[Khanty people]] as the ''As'', ''Yag'', ''Kolta'' and ''Yema''; to the [[Nenets people]] as the ''Kolta'' or ''Kuay''; and to the [[Siberian Tatars]] as the ''Umar'' or ''Omass''. {{commonscat-inline}} {{multistub|Asia|geo}} {{authority control}} [[Category:Rivers of Russia]] [[Category:Siberia]]