evidence: Bolshoi Ussuriysky Island (Russian: Большо́й Уссури́йский о́стров, romanized: Bol'shoy Ussuriyskiy Ostrov), or Heixiazi Island (simplified Chinese: 黑瞎子岛; traditional Chinese: 黑瞎子島; pinyin: Hēixiāzi Dǎo; lit. 'black bear island'[a]), is a sedimentary island at the confluence of the Ussuri and Amur rivers. Since the Sino-Russian Border Agreement that was fully implemented in 2008, Bolshoy Ussuriysky Island was divided between China and Russia. China was given control over part of the island, and Russia retained the rest. Since then, the issue has been peacefully settled, and China no longer claims the entire island. It has an area of about 327 to 350 km2 and is bounded closely by Yinlong/Tarabarov Island, and over 90 islets.[b] 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. History [edit]The 1860 Convention of Peking stipulated that the boundary between Russia and China lay along the Amur and Ussuri rivers. As such, the island at the confluence of the two rivers was Chinese. Until 2004, Bolshoy Ussuriyskiy Island was the site of a territorial dispute between mainland China and Russia. The Soviet Union forcefully occupied Bolshoy Ussuriyskiy and Yinlong Islands in 1929 in the wake of a Russo-Manchurian conflict, but this was not accepted by China. While Russia governed the islands as a part of Khabarovsk Krai, China claimed them as a part of Fuyuan County, Heilongjiang province, the easternmost part of China.