'Sea' in the Bible

Daniel spake and said, I saw in my vision by night, and, behold, the four winds of the heaven strove upon the great sea.

And four great beasts came up from the sea, diverse one from another.

His body also was like beryl [with a golden luster], his face had the appearance of lightning, his eyes were like flaming torches, his arms and his feet like the gleam of burnished bronze, and the sound of his words was like the noise of a multitude [of people or the roaring of the sea].

He will pitch his royal tents between the sea and the beautiful holy mountain, but he will meet his end with no one to help him.