Revelation 16:3
And the second angel poured his vase upon the sea and it became blood as of a dead man: and every living creature died in the sea.
Revelation 8:8-9
And the second angel sounded, and there was cast into the sea as it were a vast mountain burning with fire: and the third part of the sea became blood;
Revelation 11:6
These have power to shut up the heaven, that no rain water the earth during the days of their prophecy: and they have power over the waters to turn them into blood, and to smite the earth with every plague, as often as they will.
Revelation 10:2
and he held in his hand a little book open; and he placed his right foot on the sea, and his left on the land,
Revelation 13:1
AND I stood upon the sand of the sea, and I saw a beast rising up out of the sea, having seven heads and ten horns, and upon the horns ten diadems, and upon the heads a title of blasphemy.