Numbers 34:12

The border of the Canaanite extended from Sidon as you go toward Gerar, as far as Gaza; as you go toward Sodom and Gomorrah and Admah and Zeboiim, as far as Lasha.

All these came as allies to the valley of Siddim (that is, the Salt Sea).

On that day Yahweh cut a covenant with Abram, saying, “To your seed I have given this land, From the river of Egypt as far as the great river, the river Euphrates:

And the east border was the Salt Sea, as far as the mouth of the Jordan. And the border of the north side was from the bay of the sea at the mouth of the Jordan.

Thus says Lord Yahweh, “This shall be the boundary by which you shall apportion the land for an inheritance among the twelve tribes of Israel; Joseph shall have two portions.

“And the east side, from between Hauran, Damascus, Gilead, and the land of Israel, shall be the Jordan; from the north border to the eastern sea you shall measure. This is the east side.