Deuteronomy 3:8

8 We took the land at that time out of the hand of the two kings of the Amori who were beyond the Yarden, from the valley of the Arnon to Mount Hermon;

Deuteronomy 3:8 Meaning and Commentary

Deuteronomy 3:8

And we took at that time out of the hands of the two kings of
the Amorites
Sihon king of Heshbon, and Og king of Bashan;

the land that [was] on this side Jordan;
where Moses then was, being in the plains of Moab, and was the country beyond Jordan, with respect to the land of Canaan, and when in that:

from the river of Arnon unto Mount Hermon;
Arnon was a river which divided Moab and the Amorites, ( Numbers 22:13 ) and Hermon was a mountain of Gilead, which ended where Lebanon began, and was the northerly border of this country. It was remarkable for the dew that fell on it; (See Gill on Psalms 133:3).

Deuteronomy 3:8 In-Context

6 We utterly destroyed them, as we did to Sichon king of Heshbon, utterly destroying every inhabited city, with the women and the little ones.

7 But all the cattle, and the spoil of the cities, we took for a prey to ourselves.

8 We took the land at that time out of the hand of the two kings of the Amori who were beyond the Yarden, from the valley of the Arnon to Mount Hermon;

9 ([which] Hermon the Tzidonim call Siryon, and the Amori call it Senir;)

10 all the cities of the plain, and all Gil`ad, and all Bashan, to Salkhah and Edre`i, cities of the kingdom of `Og in Bashan.