The following is the results of your search for suphah.
Suphah: (Numbers 21:14) marg.; also R.V., a place at the south-eastern corner of
the Dead Sea, the Ghor es-Safieh. This name is found in an ode quoted
from the "Book of the Wars of the Lord," probably a collection of
odes commemorating the triumphs of God's people (comp.)