Numbers 21:13
Then they traveled to the other side of Arnon and camped in the wilderness that borders the territory of the Amorites. (Arnon borders Moab between Moab and the Amorites,
Numbers 22:36
When Balak heard that Balaam had arrived, he went out to meet him in the city of Moab on the border of Arnon at the extreme end of his territory.
Judges 11:18
"But the king of Edom wouldn't listen. So they also sent word to the king of Moab, but he wouldn't consent, either. So Israel stayed at Kadesh. Then they went through the desert, circumventing the territory belonging to Edom and Moab. They encamped on the other side of the Arnon River, but never entered the territory of Moab because the Arnon River is the border of Moab.
Numbers 21:14
which is why the Book of the Wars of the LORD reads, "Waheb and Suphah and the wadis of the Arnon,
Deuteronomy 2:24
Get ready and set out for the Wadi Arnon. Look! I've given into your control Sihon the Amorite, king of Heshbon, along with his land. Prepare to take possession by provoking him to war.
Isaiah 16:2
Like fluttering birds, like an abandoned nest, so are the daughters of Moab at the fords of the Arnon River.
Jeremiah 48:20
Moab will be put to shame, for it will be destroyed. Wail and cry out. Announce by the Arnon that Moab is destroyed.