2 Samuel 12:27

“And Joab sent messengers to David, etc.] To acquaint him how he had proceeded, and what success he had had: and said, I have fought against Rabbah; laid siege to it, and skirmished with parties that sallied out upon them: and have taken the city of waters; the same with the royal city, and so the Targum here renders it; so called because situated by the waterside; Adrichomius says f191 the river Jabbok flowed round about it: or it abounded with fountains of water, from whence the other part of the city, or what was properly the city Rabbah, was supplied with water; and which communication being cut off, it could not hold out long, which Joab being sensible of, therefore sent for David.…”

“the city of waters--Rabbah, like Aroer, was divided into two parts--one the lower town, insulated by the winding course of the Jabbok, which flowed almost round it, and the upper and stronger town, called the royal city. "The first was taken by Joab, but the honor of capturing so strongly a fortified place as the other was an honor reserved for the king himself."”

“The city of waters - The lower town of Rabbah (the modern Ammam), so called from a stream which rises within it and flows through it. The upper town with the citadel lay on a hill to the north of the stream, and was probably not tenable for any length of time after the supply of water was cut off. return to 'Top of Page'”

“Of waters - Rabbah was so called because it was encompassed with water. 2 Kings (2 Samuel) 12:28”

“Rabbah: Sa2 11:1; Deu 3:11; Eze 21:20 the city of waters: Probably that part of the city situated near the pond, from which the rest received their water. 2 Kings (2 Samuel) 12:28”