Revelation 8:8

8:8 Then the second angel blew his trumpet, and something like a great mountain of burning fire was thrown into the sea. A third of the sea became blood,

Revelation 10:2

10:2 He held in his hand a little scroll that was open, and he put his right foot on the sea and his left on the land.

Revelation 13:1

The Two Beasts

13:1 Then I saw a beast coming up out of the sea. It had ten horns and seven heads, and on its horns were ten diadem crowns, and on its heads a blasphemous name.