*Karst: A landscape formed from the dissolution of soluble rocks including limestone, dolomite and gypsum. The word, itself, is the German name of Kras, an area in Italy and Slovenia, where it is called Carso and where the phenomenon was first studied. Karst areas are characterized by sinkholes, caves, underground drainage systems and collapse triggered by the development of underlying caves (Palmer, 1991). In the popular perception, the best known feature of karst areas are stalactites and stalagmites. Reference: Palmer, A.N., (1991), "Origin and morphology of limestone caves" in the Geological Society of America Bulletin, v. 103, p 1-21.