'Sand of the Sea' in the Bible

And I stood upon the sand of the sea, and saw a savage beast ascending out of the sea, having seven heads and ten horns; and upon its horns were ten diadems; and on its heads were the named of defamation.

and he shall go forth to deceive the nations which are in the four corners of the earth. Gog and Magog, to gather them together for war; whose number is like the sand of the sea.