一、地形地貌黄河干流龙羊峡至青铜峡河段,位于青藏高原东北部和黄土高原西北部,地跨青、甘、宁三省区,全长918公里,天然水面落差1317米。其中,龙羊峡至兰州河段:属青藏高原强烈切割的中高山区,山脉海拔2800～4800米,区内山势高耸,悬崖深谷,河道狭窄,水势凶险,呈现崇山峻岭的地貌景观。主要有龙羊峡、松巴峡、李家峡、公伯峡、积石峡、寺沟峡、刘家峡、盐锅峡、八盘峡等峡谷。 I. Topography The Yellow River reaches from Longyangxia to Qingtongxia. It is located in the northeast of the Qinghai-Tibet Plateau and the northwestern Loess Plateau. It stretches 918 km across the provinces of Qinghai, Gansu and Ningxia and has a natural water surface drop of 1317 meters. Among them, the Longyangxia to Lanzhou section: a sharp cut in the high mountains of the Qinghai-Tibet Plateau, the mountain elevation of 2800 ~ 4800 meters, the towering mountain range, cliffs, river narrow, dangerous water potential, showing the topography of the mountains. There are mainly Longyangxia, Songba Gorge, Lijiaxia, Gongboxia, plot Shek Gorge, Temple ditch Gap, Liujiaxia, salt pot Gap, Gap Canyon and other eight.