The Amur River is a major river in East Asia, located between the Russian Far East and Northeastern China. It is the world's tenth longest river, at 2, 824 kilometers (1, 755 miles) long. The Amur River forms part of the border between Russia and China, and is also known as the Heilong Jiang in China. It is an important source of water for both countries, and is home to a wide variety of fish species.