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 ladder of the Chinese mainland—which form the Qutang Gorge (), the Wu Gorge (), and the Xiling Gorge () along the Yangtze River, which is where this area gets its name. The Three Gorges span from the western, upriver, cities of Fengjie and Yichang, in Chongqing Municipality, to the east, downstream, to Hubei province. The Three Gorges Reservoir Region is approximately in length, while the Three Gorges themselves occupy approximately within this region. The Three Gorges region has attracted global attention due to the Three Gorges Dam, which is changing the culture and environment of the region. Although it is