The Ob River (also known as Obi River) is located entirely in Russia.
Siberia & Russia
Russia
Russia/ western Siberia
West Siberia.
South to north.
Most rivers flow through more than one country and the links below will five a full listing.
Volga, Yenisei, Elena and Ob.
The Ob River in Russia is 2,268 miles in length. It is also called the Obi River. It is the fifth longest river in the world.
Ob River
The Ob River, the Enisei River, and the Lena River.
RUSSIA
Siberia & Russia