1. A river (or stream) flowing in a karstic area, either on the surface of the ground or through an underground cave system [20]. 2. A river that originates from a karst spring [10]. Synonyms: (French.) riviere karstique; (German.) Karstflub; (Greek.) karstikos potamos; (Italian.) corso d'acqua carsico; (Russian.) karstovaja reka; (Spanish.) rio karstico; (Turkish.) karst nehiri; (Yugoslavian.) krska rijeka, kraska reka.