Karst topography is a landscape formed on soluble rocks like limestone and gypsum, characterized by sinkholes, caves, and underground drainage, with no integrated surface drainage system as water drains underground rather than forming streams.

2.  A type of topography.
 Formed on limestone, gypsum, and other
soluble rocks
 Characterized by sinkholes, caves, and
underground drainage.
 There is no integrated surface drainage
system.
 It is not a fluvial (stream formed)
landscape.