evidence: Bolshoi Ussuriysky Island (Russian: о́стров Большо́й Уссури́йский), or Heixiazi Island (simplified Chinese: 黑瞎子岛; traditional Chinese: 黑瞎子島; pinyin: Hēixiāzi Dǎo), is a sedimentary island at the confluence of the Ussuri and Amur rivers. It is divided between the People's Republic of China (PRC) and Russia. It has an area of about 327 to 350 km² and is bounded closely by Yinlong Island (Tarabarov Island), and over ninety islets (in Chinese, Heixiazi may refer only to the large island or to the island group collectively). 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. Contents - Joint development plan of heixiazi island by china and russia - Map of Bolshoy Ussuriysky Island Jiamusi Heilongjiang Russia 680502 - History - Geography - Agreement between Russia and Peoples Republic of China - Controversy - References [...] The government of the Republic of China on Taiwan (ROC) has never recognized border treaties signed by the PRC with other countries. Therefore, the ROC still formally claims all parts of the Heixiazi Islands.