The Israelites traveled next to Oboth and camped there.
Then they went on to Iye-abarim, in the wilderness on the eastern border of Moab.
From there they traveled to the valley of Zered Brook and set up camp.
Then they moved out and camped on the far side of the Arnon River, in the wilderness adjacent to the territory of the Amorites. The Arnon is the boundary line between the Moabites and the Amorites.
For this reason speaks of “the town of Waheb in the area of Suphah, and the ravines of the Arnon River,
and the ravines that extend as far as the settlement of Ar on the border of Moab.”
From there the Israelites traveled to Beer, which is the well where the said to Moses, “Assemble the people, and I will give them water.”
References for Numbers 21:16
There the Israelites sang this song: “Spring up, O well! Yes, sing its praises!
Sing of this well, which princes dug, which great leaders hollowed out with their scepters and staffs.” Then the Israelites left the wilderness and proceeded on through Mattanah,
Nahaliel, and Bamoth.
After that they went to the valley in Moab where Pisgah Peak overlooks the wasteland.
References for Numbers 21:20