1. (Slavic.) An elongated depression in limestone or karst terrain; thus it embraces a defile, a blind valley or a ravine leading to a ponor. It can be considered as a giant grike. This meaning is based on the Serbian use [20]. 2. A variable-discharge artesian spring in which hydrostatic pressure is great enough to cause a turbulent or even fountain-like discharge. 3. A long narrow chasm enlarged by solution of the limestone [10]. 4. Large linear fissure or box valley through a karst block. Effectively a giant grike, perhaps 50 m deep and 1 km long, formed by dissolution on a fault or joint in very massive limestone [9]. Synonyms: (French.) defile, bogaz; (German.) Doline, Karstgabe, Blindtal, Zangon; (Greek.) faragothis doline; (Spanish.) zanjon; (Turkish.) bogaz; (Yugoslavia.) bogaz. See also canyon; gorge; grike; corridor; struga; zanjon.