The final warning of impending doom culminates in a vision of absolute and shocking devastation. This total collapse is not a random tragedy, but a deliberate act designed to awaken the people to Divine justice and providence. God will deliver a severe, punishing blow against the nation [מצודת דוד].
The resulting ruin is characterized by an intense, overwhelming desolation. The primary approach among commentators notes a twofold tragedy: the land will be entirely emptied of its inhabitants, and the physical ruin will be so horrific that it will leave any onlooker in a state of absolute shock and disbelief [רש"י, מצודת דוד, מצודת ציון]. Adding to this grim picture, the nature of the devastation implies a prolonged, continuous ruin brought about by the hands of foreigners [מלבי"ם].
The coming disaster will sweep across the land, reaching a place called Diblah. Commentators explain that this name actually refers to the city of Rivlah in the north [רד"ק, מצודת ציון, מנחת שי]. This location carries dark historical weight; it is the very place where the Babylonian king set up his headquarters during the siege of Jerusalem, and where the captured Judean king was ultimately brought [רד"ק, מצודת ציון]. The destruction will either originate in this northern region and spread throughout every settlement [מצודת דוד], or it will swallow the entire country, spanning from the southern desert all the way to the northern border of Rivlah. Alternatively, rather than a northern city, the name might refer to a specific location on the southern edge of the Judean desert [ביאור שטיינזלץ].
Ultimately, this sweeping devastation serves a singular purpose. When the dust settles, the people will finally recognize that God faithfully delivers a just repayment for their actions [מצודת דוד].