'Sand of the Sea' in the Bible

And I stood upon the sand of the sea. And I saw a beast rising up out of the sea having ten horns, and seven heads, and ten diadems upon its horns, and upon its heads names of blasphemy.

And he will come forth to lead astray the nations in the four corners of the earth, Gog and Magog, to gather them together to the battle, of whom the number of them is as the sand of the sea.