Cvijic (1926, 1960) distinguishes three zones of karstification: (1) dry zone in the upper part of the karst with caves almost completely dry; (2) transition zone where water flows downstream almost permanently; and (3) deep zone with slow downstream flow and local siphons [20]. Synonyms: (French.) zones de karstification; (German.) Zone der Verkarstung; (Greek.) zoni karstikopiiseos; (Italian.) zone idrogeologiche; (Spanish.) zona de karstificacion; (Turkish.) karstlasma kusagi; (Yugoslavian.) zone karstifikacije.