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Karst is a landscape formed by the dissolution of soluble bedrocks (mainly carbonate rocks such as limestone, dolomite, and gypsum), featuring sinkholes, caves, and underground streams. Karst topography is relatively fragile and unstable in geographic terms, yet it creates fabulous and unique landscapes around the world. South of China is a typical region of karst topography, where Guilin’s hills and caves, Yunnan’s Stone Forest, and Guizhou’s Xiaoqikong are the best examples.
It is estimated that some hundred million years ago, the area where Guilin is located was a gulf. In the long years, the seabed was covered with thick calcareous sediments, which were slowly dissolving and shaped by the salty seawater at the same time. Thus the original appearance of Guilin’s hills and caves had been formed. Later came the movements of the earth crust, and the seabed rose, cracked, and gradually formed the landscape of Guilin. After millions of years, with erosions of the wind, rain, and rivers, the hills and caves developed into what we can see today, fantastic and unbelievable.
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An image of a Cave In Guilin
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James' World 2 
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