From there they traveled, and encamped on the other side of the Arnon, which is in the wilderness, that comes out of the border of the Amorites: for the Arnon is the border of Moab, between Moab and the Amorites.
TSK
TSK · Joshua 12:1
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Israel struck him with the edge of the sword, and possessed his land from the Arnon to the Jabbok, even to the children of Ammon; for the border of the children of Ammon was strong.
"Rise up, take your journey, and pass over the valley of the Arnon: behold, I have given into your hand Sihon the Amorite, king of Heshbon, and his land; begin to possess it, and contend with him in battle.
Then we turned, and went up the way to Bashan: and Og the king of Bashan came out against us, he and all his people, to battle at Edrei.
This is the law which Moses set before the children of Israel:
from Aroer, which is on the edge of the valley of the Arnon, even to Mount Sion (the same is Hermon),
to the Canaanite on the east and on the west, and the Amorite, and the Hittite, and the Perizzite, and the Jebusite in the hill country, and the Hivite under Hermon in the land of Mizpah.
Now Yahweh your God has given rest to your brothers, as he spoke to them. Therefore now return and go to your tents, to the land of your possession, which Moses the servant of Yahweh gave you beyond the Jordan.
Geber the son of Uri, in the land of Gilead, the country of Sihon king of the Amorites and of Og king of Bashan; and [he was] the only officer who was in the land.
For it will be that as wandering birds, as a scattered nest, so will the daughters of Moab be at the fords of the Arnon.