“And I stood upon the sand of the sea, and saw a beast rise up out of the sea, having seven heads and ten horns, and upon his horns ten crowns, and upon his heads the name of blasphemy.”
The dragon stood on the shore of the sea, and I saw a beast coming out of the sea with ten horns and seven heads - the beast emerges from the sea of nations, drawing on Daniel 7's four beasts compressed into one. The ten horns and seven heads represent political powers and demonic authority arrayed against God's kingdom.