Three Gorges primarily famous for its scenery, the Three Gorges region is also historically and culturally important in China. Many settlements and archaeological sites are in danger of being submerged by the rising reservoir of the Three Gorges Dam. Due to the lithological conditions of its different regions, the valleys of the Three Gorges are narrow in some areas and broad in others. Most narrow valleys occur in regions where there is limestone, which is relatively hard and resists erosion. However, water can flow along deep vertical fractures, eroding underneath. As the limestone bed is gradually undercut, parts of it fall into
Three Gorges "Commentary on the Water Classic": There are seamless mountains on both sides of the Three Gorges stretching more than 200 miles. The overlapping rocks make up layers of barriers that shield against sky and sunshine so that the sun can only be seen at noon and the moon will merely show at midnight. In summers, water rises to lofty mountains, making all boats floating along or against the river get blocked. Suppose an empire has an urgent decree to issue from Baidi, it will reach Jiangling at sunset of the day. The distance between them is about 373 miles, and