John Gill Commentary Joshua 12:4

"and the border of Og king of Bashan, of the remnant of the Rephaim, who dwelt at Ashtaroth and at Edrei," — Joshua 12:4 (ASV)

And the coast of Og king of Bashan
The country that he reigned over, who was another king of the Amorites, smitten by Israel in the times of Moses:

[which was] of the remnant of the giants; (See Gill on Deuteronomy 3:11):

that dwelt at Ashtaroth and at Edrei ;
of which two places see (Deuteronomy 1:4) ; it seems as if Og had a palace in each of those cities, and sometimes was at one and sometimes at another, as is usual with kings.