Karst landform, also known as limestone landform, is the general name of surface and underground forms formed by dissolving soluble rocks by water with dissolving power. Also known as karst landform. The action of water on soluble rocks is called karstification. Generally speaking, it refers to the unique geomorphological phenomenon when carbonate rocks are distributed or groundwater flows through limestone. When rainwater or groundwater comes into contact with carbonate rocks on the ground, a small amount of carbonate will be dissolved in the water. After a long period of dissolution and erosion, the surface features marked by thousands of valleys in the surface rocks have been formed. There are often scenes such as underground rivers and caves under karst landforms.

Karst terrain has rugged surface and poor soil, which is not conducive to the development of agriculture. Therefore, there is a saying in the Yunnan-Guizhou Plateau that "there is no three-mile flat land, no three-day sunny days, and no one has three or two silvers". However, it is very popular with tourists because of its characteristics of thousands of valleys and valleys. At present, there are karst landforms in the Balkans, China, Guangxi, Guizhou and Yunnan.

This topographic geographer first made a systematic study of the karst plateau in Croatia, so it is also called karst topography. "Karst" is a highland, which is located in the south of the valley in the southwest of "Slovenia" and extends to the narrow strip near the big cities in the northeast corner of "Italy". Because most of the area is located in Slovenia, it is acceptable to simply describe it as being located in Slovenia.