evidence: The Amur River (Russian: река Амур) or Heilong River (Chinese: 黑龙江)[6] is a perennial river in Northeast Asia, forming the natural border between the Russian Far East and Northeast China (historically the Outer and Inner Manchuria). The Amur proper is 2,824 km (1,755 mi) long, and has a drainage basin of 1,855,000 km2 (716,000 sq mi).[1][7] If including its main stem tributary, the Argun, the Amur is 4,444 km (2,761 mi) long,[7][2] making it the world's tenth longest river. [...] History and context [edit]Many historical references distinguish two geopolitical entities in the area of the Amur: Manchuria (Northeast China) and Outer Manchuria.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). [...] See also [edit]- Geography of China - Geography of Russia - Sino-Soviet border conflict - List of longest undammed rivers - Sixty-Four Villages East of the Heilong Jiang - Amur Military Flotilla