It has an area of about 327 to 350 km2 and is bounded closely by Yinlong Island (Tarabarov Island), and over 90 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.
This area is approximately 327 to 350 square kilometers in size, bordered by Yinlong Island (Tarabarov Island) and over 90 islets. Its strategic importance stems from its location at the confluence of the Amur and Ussuri rivers, as well as its proximity to Khabarovsk, a major Russian city.