Every one shall howl; rather, the whole of it shall howl; i.e. the entire nation collectively (comp. Herod; 8:99; 9:24). For the foundations of Kir-Hareseth shall ye mourn. The word here translated "foundations" is elsewhere always rendered "flagons" or "flagons of wine" (2 Samuel 6:19; So 2 Samuel 2:5; Hosea 3:1).
And this rendering is more agreeable to the context than "foundations," since it is the loss of the products of the soil which is threatened in the next three verses. "Kir-Hareseth" is probably the same place as the "Kir-Moab" of Isaiah 15:1.
It was one of the principal cities of Moab (see 2 Kings 2:25).