The east sea — The Dead — sea, which lay on the east of Jerusalem. Thus a line drawn from Damascus through Auranitis, Gilead, the land of Israel beyond Jordan to the east — sea, made the eastern frontier.
Related Commentaries of Ezekiel 47:18
Ezekiel 47:18
18 And the east side ye shall measure from Hauran, and from Damascus, and from Gilead, and from the land of Israel by Jordan, from the border unto the east sea. And this is the east side.