1)
How far westwards did the borders of the Reuveni and the Gadi extend?
1.
Rashi: They extended from Gil'ad until the Brook of Arnon, including the brook itself and beyond until the Brook of Yabok, which marked the border of Amon.
2)
Having already informed us what Moshe gave to the Re'uveini and the Gadi, why does the Torah repeat it?
1.
Oznayim la'Torah: In order to stress the vast expanse of land that comprised Sichon's territory - to preempt the question how Moshe could distribute Og's land to the two families of Menasheh Sichon's to the entire tribes of Reuven and Gad.
