Deuteronomy 3:12

12 And we inherited that land at that time from Aroer, which is by the border of the torrent Arnon, and half the mount of Galaad; and I gave his cities to Ruben and to Gad.

Deuteronomy 3:12 Meaning and Commentary

Deuteronomy 3:12

And this land, which we possessed at that time
Or took possession of, having conquered it; for it still remained in their possession:

from Aroer, which is by the river Arnon:
on the borders of Moab, from thence as far as Gilead was the land which was taken from Sihon king of Heshbon, ( Deuteronomy 2:36 )

and half Mount Gilead, and the cities thereof:
which were taken from Og king of Bashan, ( Deuteronomy 3:10 )

gave I unto the Reubenites, and to the Gadites;
at their request, on certain conditions to be performed by them, afterwards repeated.

Deuteronomy 3:12 In-Context

10 All the cities of Misor, and all Galaad, and all Basan as far as Elcha and Edraim, cities of the kingdom of Og in Basan.
11 For only Og the king of Basan was left of the Raphain: behold, his bed a bed of iron; behold, in the chief city of the children of Ammon; the length of it nine cubits, and the breadth of it four cubits, according to the cubit of a man.
12 And we inherited that land at that time from Aroer, which is by the border of the torrent Arnon, and half the mount of Galaad; and I gave his cities to Ruben and to Gad.
13 And the rest of Galaad, and all Basan the kingdom of Og I gave to the half-tribe of Manasse, and all the country round about Argob, all that Basan; it shall be accounted the land of Raphain.
14 And Jair the son of Manasse took all the country round about Argob as far as the borders of Gargasi and Machathi: he called them by his name Basan Thavoth Jair until this day.

The Brenton translation of the Septuagint is in the public domain.