Translation of the information board:
Legend says that after the tragic fate of two sisters, two rivers sprang up at the places where they died. In one, the water was clear and cold, cold enough to quench the thirst of all people. The river was named Zdena.
The other, the longer one, named Bliha, broke in two on a high cliff, creating a waterfall called Bliha Waterfall, which, with its splash of countless sparks of light, always evokes sighs and admiration.
...like the silky hair of a young girl, the river settled down into the lowlands, flowing quietly into the peaceful embrace of the River Sana, its blessed mother...