Exodus 23:31-33

"And I will set thy border from the Red Sea even unto the Sea of the Philistines, and from the wilderness unto the River: for I will deliver the inhabitants of the land into your hand; and thou shalt drive them out before thee. Thou shalt make no covenant with them, nor with their gods. They shall not dwell in thy land, lest they make thee sin against me: for if thou serve their gods, it will surely be a snare unto thee."

God's plans for Israel reached into the far future, for the boundaries of Israel as outlined here were not actually reached until four hundred years later in the reigns of David and Solomon. "The River" spoken of here is the Euphrates; the Sea of the Philistines is the Mediterranean. The Red Sea is the Gulf of Aqaba. Ezion-Geber was at the head of that gulf where Solomon launched his great navy.