Albert Barnes Commentary Numbers 21:19

"and from Mattanah to Nahaliel; and from Nahaliel to Bamoth;" — Numbers 21:19 (ASV)

Nahaliel - that is, “brook of God;” the modern Wady Enkheileh. The Israelites must have crossed the stream not much above Ar.

Bamoth - Otherwise Bamoth-baal, “the high places of Baal” (Numbers 22:41): mentioned as near Dibon (Dhiban) in (Joshua 13:17), and (Isaiah 15:2). See (Numbers 32:34).