 During World War II, Nazi Germany and the Japanese Empire agreed to divide Asia along a line that followed the Yenisey to the border of China and then along the border of China and the Soviet Union.Studies have shown that the Yenisey suffers from contamination caused by radioactive discharges from a factory that produced bomb-grade plutonium in the secret city of Krasnoyarsk-26, now known as Zheleznogorsk.Irkutsk

Irkutsk ( ; ; Buryat and , "Erhüü") is the largest city and administrative center of Irkutsk Oblast, Russia.