Albert Barnes Commentary 2 Kings 14:25

"He restored the border of Israel from the entrance of Hamath unto the sea of the Arabah, according to the word of Jehovah, the God of Israel, which he spake by his servant Jonah the son of Amittai, the prophet, who was of Gath-hepher." — 2 Kings 14:25 (ASV)

He restored the border of Israel — In the course of his long reign, Jeroboam recovered the old boundaries of the Holy Land to the north, east, and southeast. The "entrance of Hamath" is mentioned as the northern boundary, while the "sea of the plain," or the Dead Sea, was the southern boundary, where Israel bordered Moab.

The entire territory east of the Jordan, which had been lost to Israel during the reigns of Jehu and Jehoahaz (2 Kings 10:33; 2 Kings 13:3, 25), was now recovered. Not only that, but Moab was also subdued (Amos 6:14), and the Syrians, in turn, were forced to submit to Israel (2 Kings 14:28). The northern conquests were perhaps just as important as the eastern ones (2 Kings 14:28).

The word of the LORD ... which He spoke — Some have suggested that the prophecy of Jonah alluded to here can be found, at least in part, in Isaiah 15:1-9 and Isaiah 16:1-14 (see 2 Kings 16:13), but this is without sufficient grounds.

This passage helps establish Jonah’s date to a period not very late in the reign of Jeroboam II—that is, from approximately 823 to 782 B.C., according to standard chronology. For more on Gath-hepher, see the related scripture reference and its accompanying note.