Chagan (Irtysh)

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Chagan
Physical characteristics
Mouth	Irtysh
• coordinates	50°37′55″N 79°15′45″E / 50.6319°N 79.2625°E / 50.6319; 79.2625Coordinates: 50°37′55″N 79°15′45″E / 50.6319°N 79.2625°E / 50.6319; 79.2625
Length	275 km (171 mi)
Basin features
Progression	Irtysh→ Ob→ Kara Sea

The Chagan (Kazakh: Шаған - Şağan) is a river in the east of Kazakhstan and a left-bank tributary of the Irtysh. It is not to be confused with the Chagan in the west of Kazakhstan, which is a tributary of the Ural. The river is 275 km long.

It is the only surface waterway on the Semipalatinsk Test Site, which was used as the primary testing venue for the Soviet Union's nuclear weapons. The river flows along the eastern boundary of the test site and fills the "Atomic Lake" Lake Chagan (or Lake Balapan), a lake created by the Chagan nuclear test.

References[]

• Radioactive contamination of the Shagan River ecosystem
• On the Soviet nuclear program