Top 7 in Top 10 Longest rivers of the planet.
The Obi River is a major river in western Siberia, Russia, and the fourth-longest river in the country.
The Obi River is formed in Altai Krai, 13 kilometres (8 mi) southwest of Biysk, due to the tributaries of the Biya and Katun rivers. Both rivers originate in the Altai Mountains. The Biya River, 301 km (187 mi) long, flows from Lake Teletskoye, while the Katun River is 688 km (427 mi) long, flowing from a glacier on Byelukha mountain. The Obi River flows to the west and north until it reaches the latitude 55 ° north, where it bends northwards, and again northwards, and eventually turns north to the northeast to fill the Bay of Obi, a 966 km (600 mi) Bay of the Kara Sea, linking into the Arctic Ocean.