3 And the second poured out his cup into the sea; and it became blood, as of a dead man; and every living thing died that was in the sea.
Revelation 16:3 Cross References - ABU
Revelation 8:8-9
Revelation 10:2
2 And he had in his hand a little book opened. And he set his right foot upon the sea, and the left upon the land;
Revelation 11:6
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 13:1
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 crowns, and upon his heads names of blasphemy;