For Gath, see Joshua 13:3 note. Its native king, Achish 1-Kings 2:39, is to he regarded, not as an independent monarch, but as one of the many vassal-kings over whom Solomon reigned 2-Chronicles 9:23. For Mareshah, see Joshua 15:44, for Ziph, Joshua 15:55.

And Gath,.... Which cannot be that Gath which was one of the principalities of the Philistines, but a city in the tribe of Judah; though of it we nowhere else read; unless this is the same with Moreshethgath, Micah 1:14, which is probable, since it follows:
and Mareshah; the birth place of Micah the prophet, Micah 1:1,
and Ziph; there were two cities of this name in the tribe of Judah, Joshua 15:24.

Gath, a royal city of the Philistines, which was first made subject to the Israelites by David (1-Chronicles 18:1), and was under Solomon the seat of its own king, who was subject to the Israelite king (1-Kings 2:39), has not yet been certainly discovered; see on Joshua 13:3.
(Note: C. Schick, Reise in das Philisterland (in "Ausland" 1867, Nr. 7, S. 162), identifies Gath with the present Tel Safieh, "an isolated conical hill in the plain, like a sentinel of a watchtower or fortress, and on that account there was so much struggling for its possession." On the other hand, Konr. Furrer, Wanderungen durch Palstina, Zrich 1865, thinks, S. 133, that he has found the true situation of Gath in the Wady el Gat, northward of the ruins of Askalon.)
Mareshah, the city Marissa, on the road from Hebron to the land of the Philistines, was at a later time very important, and is not represented by the ruin Marash, twenty-four minutes to the south of Beit-Jibrin (Eleutheropolis); see on Joshua 15:44, and Tobl. dritte Wand. S. 129, 142f. Ziph is probably the Ziph mentioned in Joshua 15:55, in the hill country of Judah, of which ruins yet remain on the hill Ziph, about an hour and a quarter south-east of Hebron; see on Joshua 15:55. C. v. Raumer thinks, on the contrary, Pal. S. 222, Anm. 249, that our Ziph, as it is mentioned along with Mareshah and other cities of the lowland, cannot be identified with either of the Ziphs mentioned in Joshua 15:24 and Joshua 15:55, but is probably Achzib in the lowland mentioned along with Mareshah, Joshua 15:44; but this is very improbable.