Bolshoi Ussuriysky Island (Russian: Большо́й Уссури́йский о́стров Bol'shoy Ussuriyskiy Ostrov), or Heixiazi Island (simplified Chinese: 黑瞎子岛; traditional Chinese: 黑瞎子島; pinyin: Hēixiāzi Dǎo; lit. "black blind island"), 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.