Question

the ob river can be found in

north America or Europe or Africa or south America or asia

Answer 1

The Ob River, also Obi, is a major river in western Siberia, Russia and is the world's seventh longest river. It is the westernmost of the three great Siberian rivers that flow into the Arctic Ocean. The Gulf of Ob is the world's longest estuary.

Answer 2

Image result for siberia is where
According to this definition, Siberia extended eastward from the Ural Mountains to the Pacific coast, and southward from the Arctic Ocean to the border of Russian Central Asia and the national borders of both Mongolia and China.(this is where siberia is )