Deuteronomy 3:8

8 So at that time we took the territory east of the Jordan River. We captured it from those two Amorite kings. The territory goes all the way from the Arnon River valley 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 completely destroyed them. We did to them just as we had done to Sihon, the king of Heshbon. We destroyed all of their cities. We destroyed the men, women and children.

7 But we kept for ourselves the livestock and everything else we took from their cities.

8 So at that time we took the territory east of the Jordan River. We captured it from those two Amorite kings. The territory goes all the way from the Arnon River valley to Mount Hermon.

9 Hermon is called Sirion by the people of Sidon. The Amorites call it Senir.

10 We captured all of the towns on the high flatlands. We took the whole land of Gilead. And we captured the whole land of Bashan as far away as Salecah and Edrei. Those were towns that belonged to Og's kingdom in Bashan.