Charles Ellicott Commentary Judges 8:10

"Now Zebah and Zalmunna were in Karkor, and their hosts with them, about fifteen thousand men, all that were left of all the host of the children of the east; for there fell a hundred and twenty thousand men that drew sword." — Judges 8:10 (ASV)

In Karkor. —This was the scene of the third battle, or massacre. When they had reached this distant point they probably felt secure. Karkor means, “a safe enclosure,” and the Vulgate, regarding it as an ordinary noun, renders it, “where Zebah and Zalmunna were resting.”

Eusebius and Jerome identify Karkor with a fortress named Karkaria, a day’s journey north of Petra; but, from the mention of Nobah and Jogbehah in the next verse, this seems to be too far south. If so, it may be Karkagheisch, not far from Amman (Rabbath Ammon), mentioned by Burckhardt. It was, however, “at a very great distance” (Jos., Antt. viii. 6, § 5) from the original scene of battle.