'Salt pits' in the Bible

The whole land will be covered with salt pits and burning sulfur, with nothing planted, nothing sprouting, and producing no vegetation overthrown like Sodom, Gomorrah, Admah, and Zeboiim, when the LORD overthrew them in his raging fury.

Therefore as I live, saith the LORD of hosts, the God of Israel, Surely Moab shall be as Sodom, and the children of Ammon as Gomorrah, even the breeding of nettles, and saltpits, and a perpetual desolation: the residue of my people shall spoil them, and the remnant of my people shall possess them.