evidence: Bolshoi Ussuriysky Island, or Heixiazi Island, is a sedimentary island at the confluence of the Ussuri and Amur rivers. It is divided between the People's Republic of China and Russia. It has an area of about 327 to 350 km2 and is bounded closely by Yinlong Island, and over ninety islets. Its position at the confluence of the Amur and the Ussuri and right next to the major Russian city of Khabarovsk, has given it great strategic importance. Download Download See moreWikipedia https://en.wikipedia.org/wiki/Bolshoy_Ussuriysky_Island