What Are the Biggest Rivers in the World?

7. Ob River

Located in Western Siberia in Russia, the Ob River or the Obi flows for 2,268 miles from its source in the Katun Mountains. The westernmost of Siberia’s three great rivers, the Ob has the planet’s longest estuary. The river flows into the Gulf of Ob, which is part of the Arctic Ocean. The Ob is important to the people who live near its banks; it provides water, fish, irrigation, and hydroelectric energy. Major cities that have grown up on the Ob include Barnaul, Novosibirsk, and Surgut.