Charles Ellicott Commentary Jeremiah 48:18

"O thou daughter that dwellest in Dibon, come down from thy glory, and sit in thirst; for the destroyer of Moab is come up against thee, he hath destroyed thy strongholds." — Jeremiah 48:18 (ASV)

Thou daughter that dost inhabit Dibon.— Dibon is mentioned among the cities of Moab in Numbers 21:30; Isaiah 15:2, and as rebuilt by the Gadites in Numbers 33:45. It is prominent in the Moabite Stone inscription as a royal city. In the distribution of the conquered territory it fell to the lot of Reuben (Joshua 13:7; Joshua 13:9), but must afterwards have been retaken by Moab. The “strongholds” indicate a fortress.

In Isaiah 15:9 it appears under the form of Dimon, and is there described as abounding in water, its site probably being on the north bank of the Arnon. This last feature gives point to the words of the prophet here. Its waters will not save its inhabitants from the thirst which falls on those who are dragged as captives into exile.