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In page Amur:

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Many historical references distinguish two geopolitical entities in the area of the Amur: Manchuria (Northeast China) and Outer Manchuria. The Chinese province of Heilongjiang on the south bank of the river takes its name from the river, as does the Russian Amur Oblast on the north bank. The native Manchu people and their Qing Empire of China, who regarded this river as sacred,[citation needed] use the name Sahaliyan Ula (Black River).