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Which part of the China-Russia border is formed by the Amur River?

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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 forms a significant portion of the international border between China and Russia, specifically separating China’s Heilongjiang province from southeastern Siberia in Russia.1

The river serves as this boundary for much of its course as it flows generally east and southeast. This border section encompasses the upper and middle reaches of the river, extending from the confluence of the Shilka and Argun rivers down to the Russian city of Khabarovsk. At Khabarovsk, the river turns northeastward and flows entirely across Russian territory until it reaches the Tatar Strait.12