'Sand of the Sea' in the Bible

But Isaiah cries concerning Israel, Though the number of the children of Israel is as the sand of the sea, a remnant shall be saved;

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

and go forth to deceive the nations which are in the four quarters of the earth, the Gog and the Magog [the king and the people], and to assemble them together to battle, whose number is as the sand of the sea.