That dost inhabit Dibon - This was anciently a city of the Reubenites, afterwards inhabited by the Moabites, about two leagues north of the river Arnon, and about six to the east of the Dead Sea. - Dahler.
Sit in thirst - Jeremiah draws a picture of the conquered inhabitants, collected outside the walls, waiting for their captors to march them away to the slave mart. The enemy occupied with plundering the houses of Dibon thinks little of the hunger and thirst of his prisoners.
Strong holds - The remains of the fortifications of Dibon are still visible.