Gong River or Gongshui is a river of China. It is part of the East China Sea basin as a headwater of the Gan River, which itself is a tributary of the Yangtze. The Gong river flows in Jiangxi province and is the main tributary of the Gan river, itself a tributary of the Yangtze. The river watershed has an area of 27,074 square kilometers. The average flow of the river is …Gong River or Gongshui is a river of China. It is part of the East China Sea basin as a headwater of the Gan River, which itself is a tributary of the Yangtze. The Gong river flows in Jiangxi province and is the main tributary of the Gan river, itself a tributary of the Yangtze. The river watershed has an area of 27,074 square kilometers. The average flow of the river is 700 cubic meters per second. Its main tributaries are the Tao and Ping rivers.