Numbers 21:10-13

MSB(i) 10 Then the Israelites set out and camped at Oboth. 11 They journeyed from Oboth and camped at Iye-abarim in the wilderness opposite Moab to the east. 12 From there they set out and camped in the Valley of Zered. 13 From there they moved on and camped on the other side of the Arnon, in the wilderness that extends into the Amorite territory. Now the Arnon is the border between the Moabites and the Amorites.