The description is borrowed from the local features of the Dead Sea and its vicinity. The towns of the Vale of Siddim were fertile and well-watered…

And that the whole land thereof is brimstone, and salt, and burning, that it is not sown, nor beareth, nor any grass groweth therein. —Can…

[And that] the whole land thereof [is] brimstone and salt ,
[and] burning
That is, is…

Idolatry would be the ruin of their nation. It is no new thing for God to bring desolating judgments on a people who profess to be near him. He nev…