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Where does the Amur River begin?

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Topographic map of the Amur River basin and its drainage network, covering parts of northeastern China, eastern Russia, Mongolia, and North Korea. The map uses color shading to indicate elevation, shows major rivers and tributaries, surrounding mountain ranges, swamps, marshes, and lakes, and includes a locator inset of the region within Asia. Major cities, railways, and dams are also marked. — Amur River The Amur River basin and its drainage network.

The Amur River proper begins at the confluence of the Shilka River and the Argun River.1

While the Amur itself starts at this junction, its headwaters originate further inland across Russia, Mongolia, and China. Specifically, the Shilka is formed by the junction of the Ingoda and Onon rivers, which have sources in the Yablonovy Range on the Siberian-Mongolian border, while the Argun rises in Inner Mongolia.21