Deuteronomy 2:37

2:37 However, you did not approach the land of the Ammonites, the Wadi Jabbok, ¹  the cities of the hill country, or any place else forbidden by the Lord our God.

Deuteronomy 3:16

3:16 To the Reubenites and Gadites I allocated the territory extending from Gilead as far as Wadi Arnon (the exact middle of the wadi was a boundary) all the way to the Wadi Jabbok, the Ammonite border.

[2:37]  ¹ sn Wadi Jabbok. Now known as the Zerqa River, this is a major tributary of the Jordan that normally served as a boundary between Ammon and Gad (Deut 3:16).