Простиралась

30 О́бласть,

30 [Area, Oblast, Region],

где они́ жи́ли,

[somewhere, where, wherever] [they, they are] lived,

простиралась от Ме́ши до Сефара в восто́чных наго́рьях.

простиралась from Mesha [before, until] Сефара [at, in, of, on] [east, eastern] [highland, uplands].

The territory in which they lived extended from Mesha in the direction of Sephar to the hill country of the east.
Genesis 10:30 ESV

And their dwelling was from Mesha,
as thou goest unto Sephar a mount of the east.
Genesis 10:30 KJV