Landscape developed on soluble bedrock (commonly carbonate rocks such as limestone or dolomite, or evaporites) dominated by dissolution processes and characterized by features such as sinkholes (dolines), caves, subterranean drainage, and disrupted surface drainage.

Principle

Karst forms where chemically aggressive water (acidified by CO2 or other solutes) circulates through fractures and pore spaces in soluble rock, enlarging conduits by dissolution; the coupling of rock chemistry, structural permeability, and groundwater flow organizes distinctive subterranean and surface morphologies.

Demonstration

A terrain where surface streams disappear into sinkpoints and re-emerge at springs, with a network of caves and enlarged joints that route most recharge underground and create locally thin soils and irregular topography dominated by dolines and karren.

Misapplication

Labeling any rocky area with caves or sinkholes as karst when the features result from volcanic, tectonic, or coastal processes (pseudokarst), or assuming uniform groundwater behavior across karst systems without mapping conduits.

Consequence

Recognition of karst terrain implies high vulnerability of groundwater to contamination, complex and rapid subsurface flowpaths that complicate water supply and hazard planning, unique ecological niches, and engineering constraints for construction and land-use planning.

Reversal

The converse is a non‑soluble‑rock landscape where surface runoff and soil-mantled processes dominate, with predictable surface drainage and limited subsurface conduit development.

Boundary

Applies to landscapes underlain by soluble lithologies and shaped primarily by chemical solution and conduit development; excludes pseudokarst forms (lava tubes, certain sea cliffs), purely mechanical cave systems, and karstified rocks altered chiefly by diagenesis rather than modern dissolution.

Semantic Tension

Tension occurs between strict lithologic/process definitions of karst (need for dissolution of soluble rock) and broader geomorphological uses that emphasize the presence of caves or sinkholes irrespective of origin (where pseudokarst confounds classification).

Synthesis

Karst terrain is a dissolution-governed landscape on soluble bedrock where coupled hydrochemical and structural controls produce subterranean conduits and disrupted surface drainage; identifying karst requires evidence of solutional origin and conduit-dominated hydrology.