'River' in the Bible

Now Solomon ruled over all the kingdoms from the River to the land of the Philistines and to the border of Egypt; they brought tribute and served Solomon all the days of his life.

For he had dominion over everything west of the River, from Tiphsah even to Gaza, over all the kings west of the River; and he had peace on all sides around about him.

“For the Lord will strike Israel, as a reed is shaken in the water; and He will uproot Israel from this good land which He gave to their fathers, and will scatter them beyond the Euphrates River, because they have made their Asherim, provoking the Lord to anger.