Восточной

30 Поселения их бы́ли от Меши до Сефара,

30 Поселения [them, their] [been, has been, were] from Меши [before, until] Сефара,

горы восточной.

[mountains, the mountains] восточной.

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