'Sea' in the Bible

Then they were filled with terror, and began to say to one another, "Who is this, then? For even wind and sea obey Him."

"And whoever shall occasion the fall of one of these little ones who believe, he would be better off if, with a millstone round his neck, he were lying at the bottom of the sea.

In solemn truth I tell you that if any one shall say to this mountain, 'Remove, and hurl thyself into the sea,' and has no doubt about it in his heart, but stedfastly believes that what he says will happen, it shall be granted him.