John Gill Commentary Deuteronomy 2:13

"Now rise up, and get you over the brook Zered. And we went over the brook Zered." — Deuteronomy 2:13 (ASV)

Now rise up, said I, and get you over the brook Zered. It is called the valley of Zered (Numbers 21:12), the word used signifying both a valley and a brook; and it is very probable there were both a valley and a brook of the same name.

It must be near Dibongad, since in one place it is said the Israelites came from Ijim and pitched in Zered; and in another place that they came from there, and pitched in Dibongad (Numbers 21:11, Numbers 21:12 and Numbers 33:45).

and we went over the brook Zered; which was fordable, or perhaps at this time dried up.