Deuteronomy 3:16

16 and to the Re'uveni and the Gadi I gave the territory from Gil'ad to the Arnon Valley, with the middle of the valley as the border, as far as the Yabok River, which is the border with the people of 'Amon;

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 Ya'ir the son of M'nasheh took all the region of Argov, as far as the border with the G'shuri and the Ma'akhati; he named this whole area, including Bashan, after himself -it remains Havot-Ya'ir to this day.

15 "I gave Gil'ad to Machir;

16 and to the Re'uveni and the Gadi I gave the territory from Gil'ad to the Arnon Valley, with the middle of the valley as the border, as far as the Yabok River, which is the border with the people of 'Amon;

17 the 'Aravah too, the Yarden being its border, from Kinneret to the Sea of the 'Aravah, the Dead Sea, at the foot of the slopes of Pisgah to the east.

18 "At that time I gave you this order: 'ADONAI your God has given you this land to possess. But all of you who are fit to fight must cross over, armed, ahead of your brothers the people of Isra'el.