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The Trebišnjica River is an impressive geologic sight which is typical for the karst. The river looses various times and reappears at resurgences. As a matter of fact man tries to influence on this for centuries, with some astonishing results in the last century. Several ponors or sinks were filled with concrete, water was dammed and canalized and even the production of electricity with two hydroelectric power plants is now reality. The river is of great geologic interest and the power company is eager to explain the geographic, geologic and technological background.