Ai — A city of the Ammonites, not the same mentioned, Joshua 7:2, for that was on the other side Jordan. By the hedges — Where they might be hidden, and not so easily seen.
Related Commentaries of Jeremiah 49:3
Jeremiah 49:3
3 Howl, O Heshbon, for Ai is spoiled: cry, ye daughters of Rabbah, gird you with sackcloth; lament, and run to and fro by the hedges; for their kinga shall go into captivity, and his priests and his princes together.