'Sea' in the Bible

It would be more profitable for him if a millstone were hanged about his neck and he cast into the sea, than that he should be a snare to one of these little ones.

But the Lord said, If ye have faith as a grain of mustard seed, ye had said to this sycamine tree, Be thou rooted up, and be thou planted in the sea, and it would have obeyed you.

And there shall be signs in sun and moon and stars, and upon the earth distress of nations in perplexity at the roar of the sea and rolling waves,