Easton's Bible Dictionary: M. G. Easton, M.A., D.D.

Sea, The

(Heb.yam), signifies

1. "the gathering together of the waters," the ocean (Gen. 1:10);
2. a river, as the Nile (Isa. 19:5), the Euphrates (Isa. 21:1; Jer. 51:36);
3. the Red Sea (Ex. 14:16, 27, 15:4, etc.);
4. the Mediterranean (Ex. 23:31; Num. 34:6, 7; Josh. 15:47; Ps. 80:11, etc.);
5. the "sea of Galilee," an inland fresh-water lake, and
6. the Dead Sea or "salt sea" (Gen. 14:3; Num. 34:3, 12, etc.). The word "sea" is used symbolically in Isa. 60:5, where it probably means the nations around the Mediterranean. In Dan. 7:3, Rev. 13:1 it may mean the tumultuous changes among the nations of the earth.