'Salt pits' in the Bible

“Therefore, as I live,” declares the Lord of hosts,The God of Israel,“Moab will in fact become like SodomAnd the sons of Ammon like Gomorrah,A land possessed by nettles and salt pits,And a perpetual desolation.The remnant of My people will plunder themAnd what is left of My nation will inherit them [as their own].”