Revelation 16:3
And the second poured out his vial into the sea; and it became blood, as of a dead man, and every living thing died, that was in the sea.
Revelation 8:8-9
And the second angel sounded, and as it were a great mountain burning with fire was cast into the sea;
Revelation 11:6
These have power to shut heaven, that it rain not in the days of their prophecy; and have power over the waters, to turn them to blood, and to smite the earth with every plague, as often as they will.
Revelation 10:2
And he had in his hand a little book open. And he set his right foot upon the sea, and the left upon the land;
Revelation 13:1
And I stood upon the sand of the sea. And I saw a beast coming up out of the sea, having ten horns and seven heads, and upon his horns ten diadems, and upon his heads names of blasphemy.