karstinähtus; karsti pinnavormide kompleks, mis on kujunenud intensiivse kivimite lahustumise tagajärjel soojas ja niiskes kliimas ja mida iseloomustab kõrgete (mitusada m) püstloodsete seintega skulptuursete jäänukvormide esinemine, is a spectacular variety of karst land/forms/scape dominated by steep, vertical or even overhanging sided rock/limestone towers. Towers originate as residuals of former easily soluble rock massif; occurs in tropical and sub-tropical climate zones and is sometimes called tropical karst. By far the most extensive and best developed tower karst is in the Guangxi province of southern China. Cone karst is the more common and less spectacular form of this landscapes with limestone hills, residual cones, typically covered by rain forest.