Shilka shēlˈkə [key], river, c.345 mi (560 km) long, formed E of Chita, Chita oblast, SE Siberian Russia, by the confluence of the Onon and Ingoda rivers, both of which rise along the Mongolian-Russian border. It flows northeast past Shilka, Sretensk (head of navigation), and Ust-Karsk, joining the Argun River to form the Amur River on the Russia-China border.

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