Solomon ruled over all the kingdoms from the Euphrates to the land of the Philistines and to the border of Egypt. They brought tribute and served Solomon all the days of his life.
Such a kingdom, and such a court, surely never any prince had, as Solomon's are here described to be. I. Such a kingdom. Never did the crown of Israel shine so brightly as it did when Solomon wore it, never in his father's days, never in the days of any of his successors; nor was that kingdom ever so glorious a type of the kingdom...
Commenting on 1 Kings 4:20-28
For he had dominion over all the region on this side the river,.... Or beyond the river Euphrates, in the sense before given, Kg1 4:21; which accounts for the plenty of provisions he had, and the revenue with which he supported such a table he kept: from Tiphsah even to Azzah; or Gaza, one of the five principalities of the Philistines.
Solomon reigned over all kingdoms from the river--All the petty kingdoms between the Euphrates and the Mediterranean were tributary to him. Similar is the statement in Kg1 4:24.