Numbers 21:13

21:13 From there they moved on and camped on the other side of the Arnon, in the wilderness that extends from the regions of the Amorites, for Arnon is the border of Moab, between Moab and the Amorites.

Numbers 24:1

Balaam Prophesies Yet Again

24:1 When Balaam saw that it pleased the Lord to bless Israel, he did not go as at the other times to seek for omens, but he set his face toward the wilderness.