Selenga River is a major river in Mongolia and Buryatia, Russia.
Originating from its headwater tributaries, the Ider and the Delger mörön, it flows for 992–1,024 kilometres (616–636 mi)[2][3][4] before draining into Lake Baikal.
The Selenga therefore makes up the most distant headwaters of the Yenisey-Angara river system.

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