Adam Clarke on Jeremiah 48:6

Flee, save your lives - The enemy is in full pursuit of you.

Be like the heath - כערוער caaroer, "like Aroer;" which some take for a city, others for a blasted or withered tree. It is supposed that a place of this name lay towards the north, in the land of the Ammonites, on a branch of the river Jabbok; surrounded by deserts. Save yourselves by getting into the wilderness, where the pursuing foe will scarcely think it worth his while to follow you, as the wilderness itself must soon destroy you.