Deuteronomy 3:8

8 So at that time we took the land east of the Jordan River, from the Arnon Ravine to Mount Hermon, from these two Amorite kings.

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 completely destroyed them, just like the cities of Sihon king of Heshbon. We killed all the men, women, and children,

7 but we kept all the cattle and valuable things from the cities for ourselves.

8 So at that time we took the land east of the Jordan River, from the Arnon Ravine to Mount Hermon, from these two Amorite kings.

9 (Hermon is called Sirion by the Sidonian people, but The Amorites call it Senir.)

10 We captured all the cities on the high plain and all of Gilead, and we took all of Bashan as far as Salecah and Edrei, towns in Og's kingdom of Bashan.