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葛洲坝水利枢纽,位于长江三峡出口—南津关下游3公里的湖北宜昌市境内,是在长江干流上修建的第一个水利枢纽。长江出南津关后,由高山峡谷河段进入丘陵宽谷河段,江面由300米展宽至2200米。坝址处原有葛洲坝、西坝两岛,自右至左把长江分割为大江、二江、三江。大江宽800米,河床最低高程30～31米,枯水季水深约10米,为长江的主航道。二江宽300米,三江宽550米,河床高程分别为43米和46米,枯水季断流。
Gezhouba Dam is located in the territory of Yichang, Hubei Province, 3 kilometers downstream of the Three Gorges of the Yangtze River, 3 kilometers downstream of Nanjin Pass. It is the first water control project built on the main stream of the Yangtze River. After the Yangtze River out of the South Jin Guan, from the high mountain gorge into the hilly valley section, the river from 300 meters widened to 2200 meters. Gezhouba dam site at the original dam, Xiba two islands, from right to left to the Yangtze River into two rivers, three rivers. 800 meters wide river, the lowest elevation of 30 to 31 meters, the dry season about 10 meters deep, the main channel for the Yangtze River. Two meters wide and 300 meters wide, Sanjiang wide 550 meters, river bed elevation of 43 meters and 46 meters, dry season off flow.