Fun fact 5 about Ob-Irtysh
river
In the lower reaches of the Ob, the maximum permissible concentrations of petroleum products are exceeded by 9–10 times.
Ob-Irtysh
Multiple
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river
Ob-Irtysh
Multiple
Length
5,410 km
Mouth
Gulf of Ob
Countries
Russia, Kazakhstan, China, Mongolia
The Ob is a major river in Russia. It is in western Siberia, and with its tributary the Irtysh forms the world's seventh-longest river system, at 5,410 kilometres (3,360 mi). The Ob forms at the confluence of the Biya and Katun which have their origins in the Altai Mountains.
From the “Pollution” section
Text from Wikipedia, CC BY-SA 4.0.
Photo: Dmitry Karyshev · CC BY 2.0