Deuteronomy 3:8

8 At that time we took their land from the two kings of the Amorites on the far side of Jordan, 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 And we put them to the curse, every town together with men, women, and children.

7 But we took for ourselves all the cattle and the stored wealth of the towns.

8 At that time we took their land from the two kings of the Amorites on the far side of Jordan, from the valley of the Arnon to Mount Hermon;

9 (By the Sidonians, Hermon is named Sirion, and by the Amorites Shenir;)

10 All the towns of the table-land and all Gilead and Bashan as far as Salecah and Edrei, towns of the kingdom of Og in Bashan.