Deuteronomy 3:16

16 And to the tribes of Reuben and Gad I assigned the territory from Gilead to the Arnon River. The middle of the river was their southern boundary, and their northern boundary was the Jabbok River, part of which formed the Ammonite border.

Deuteronomy 3:16 Meaning and Commentary

Deuteronomy 3:16

And unto the Reubenites, and unto the Gadites
The tribes of Reuben and Gad:

I gave from Gilead even unto the river Arnon:
see ( Deuteronomy 3:12 )

half the valley and the border;
or rather half the river, the river Arnon; and so it is rendered "the middle of the river", in ( Joshua 12:2 ) and so here the middle of the torrent by the Vulgate Latin and Septuagint versions, and by Onkelos:

even unto the river Jabbok, which is the border of the children of
Ammon;
beyond which the land given to the tribes of Reuben and Gad reached not; see ( Deuteronomy 2:37 ) .

Deuteronomy 3:16 In-Context

14 Jair, from the tribe of Manasseh, took the entire region of Argob, that is, Bashan, as far as the border of Geshur and Maacah. He named the villages after himself, and they are still known as the villages of Jair.)
15 "I assigned Gilead to the clan of Machir of the tribe of Manasseh.
16 And to the tribes of Reuben and Gad I assigned the territory from Gilead to the Arnon River. The middle of the river was their southern boundary, and their northern boundary was the Jabbok River, part of which formed the Ammonite border.
17 On the west their territory extended to the Jordan River, from Lake Galilee in the north down to the Dead Sea in the south and to the foot of Mount Pisgah on the east.
18 "At the same time, I gave them the following instructions: "The Lord our God has given you this land east of the Jordan to occupy. Now arm your fighting men and send them across the Jordan ahead of the other tribes of Israel, to help them occupy their land.
Scripture taken from the Good News Translation - Second Edition, Copyright 1992 by American Bible Society. Used by Permission.