位于长江干流宜昌上游40公里处三斗坪镇西北部江中的中堡岛,是三峡水利枢纽工程的坝址。中堡岛呈“鲤鱼”形,面积为1.5万平方米,它将长江河槽分为两支,主河槽偏左,宽约700～800米。中堡岛顺流分布长约1000米,宽约160～220米。这里是五千年前 Located in the upper reaches of the Yangtze River, Yichang, 40 kilometers upstream of Sandouping Town in the northwest of the Fort Island, is the dam site of the Three Gorges hydro project. The fort island was “carp” -shaped, with an area of ​​15,000 square meters. It divides the Yangtze River fluvial into two branches, with the main channel to the left and a width of 700 to 800 meters. Fort in the downstream distribution of about 1,000 meters, a width of 160 to 220 meters. This is five thousand years ago