Ai - Not the town on the west of the Jordan Joshua 7:2; a place not mentioned elsewhere. For Ai some read Ar.
Hedges - Fields were not divided by hedges until recent times; the term probably means the walls which enclose the vineyards Numbers 22:24.
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.