karst A feature shaped by the dissolution of a soluble layer or layers of bedrock, usually carbonate rock such as limestone or dolomite. These landscapes display distinctive surface features and underground drainages, and in some examples there may be little or no surface drainage. ENVO ENVO:00000175 EcoLexicon:karst FTT:894 Geonames:T.KRST SWEETRealm:Karst TGN:21509 Wikipedia:Karst karst karst area physiographic feature