Deuteronomy 2:36

36 aFrom Aroer, which is on the edge of the Valley of the Arnon, and from bthe city that is in the valley, as far as Gilead, there was not a city too high for us. cThe Lord our God gave all into our hands.

Deuteronomy 3:12

12“When we took possession of this land at that time, I gave to the Reubenites and the Gadites the territory beginning dat Aroer, which is on the edge of the Valley of the Arnon, and half the hill country of Gilead with eits cities.
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