“And the third angel poured out his vial upon the rivers and fountains of waters; and they became blood.”
King James Version (KJV)
16:4 The third poured out his phial on the rivers and fountains of water - Which were over all the earth. And they became blood - So that none could drink thereof.
Re 16:4-7 THE THIRD VIAL. And the third angel poured out his vial. John sees the third "vial poured upon the rivers and fountain of waters; and they become blood".