Karst is a type of typography formed on limestone, gypsum, and other rocks that dissolve in natural acid. Karst describes landscapes characterized by caves, sinkholes, and underground drainage. In this kind of landscape, streams disappear into the ground and reappear elsewhere as large springs.

Valleys, plateaus, towers, pinnacles, and ponds are all surface features in regions with karst. Below the surface are caves, fractures, and partings - all components of a drainage network. The type locality of karst is a limestone plateau in the Dinaric Alps of northwestern Yugoslavia and northeastern Italy.