Tiphsah; either that Tiphsah, 2 Kings 15:16, which was in the kingdom of Israel within Jordan; or rather, another place of that name upon the river now mentioned, to wit, Euphrates, even that eminent city which is mentioned by Ptolemy, and Strabo, and Pliny, called Thapsarum. And this best agrees with the following Azzah, which was the border of Canaan in the south and west, Genesis 10:19 Deuteronomy 2:23, as Tiphsah was in the north and east. And so his dominion is described by both its borders. All the kings on this side the river; who owned subjection and paid tribute to him.
Related Commentaries of 1 Kings 4:24
1 Kings 4:24
24 For he had dominion over all the region on this side the river, from Tiphsah even to Azzah, over all the kings on this side the river: and he had peace on all sides round about him.