What does Jeremiah 48:1 mean?

This is what the Lord says about Moab: Trouble is coming to Nebo—it’ll be ruined. Kiriathaim will be disgraced and captured. The fortress will be put to shame and broken down. Jeremiah 48:1 - Modern Text Bible

(God announces disaster for Moab’s cities, starting with Nebo and Kiriathaim, which will be conquered and humiliated.)