Its source is located on the outskirts of village Proložac near town of Imotski, Croatia.

Rising from a strong karstic spring, it flows often short stretches before it sinks again.

Because the Trebižat (river) disappears and reappears at resurgences various times, the people used to call it different names.

Dinaric karst water systems support 25% of the total of 546 fish species in Europe, many endemic.

The Neretva River basin, together with four other areas in the Mediterranean, has the largest number of threatened freshwater fish species.