Numbers 34:3

Your southern edge will be from the desert of Zin toward the side of Edom, and your southern border will be from the end of the Salt Sea to the east;

Genesis 14:3

All these joined forces at the valley of Siddim (that [is], the sea of the salt).

Ezekiel 47:13

Thus says the Lord Yahweh: "This [is] the boundary [by] which you shall distribute the land for {the twelve} tribes of Israel: Two shares [shall be for] Joseph.

Exodus 23:31

" 'And I will set your boundary from the {Red Sea} and up to the sea of the Philistines and from [the] desert up to the river, because I will give the inhabitants of the land into your hand, and you will drive them out from before you.

Joshua 3:16

the waters flowing down from above stood [still]; they stood up [in] one heap very far from Adam, the city that [is] beside Zarethan, while [the waters] flowing down to the sea of the Arabah, the Salt Sea, {were completely cut off}; and the people crossed [over] opposite Jericho.

Joshua 15:1-12

The allotment for the tribe of the descendants of Judah according to their families reached to the border of Edom, to the wilderness of Zin, {to the far south}.

Ezekiel 47:8

And he said to me, "These waters [are] going out to the eastern region, and they go down to the {Jordan Valley}, and they come [to] the sea [and flow] into the sea [where] {they issue out}, and the waters [in the sea] will be healed.

Ezekiel 47:18-23

{And the eastern boundary} [will be] between Hauran and Damascus, and from between Gilead and the land of Israel [along] the Jordan [River] from [the] boundary on the eastern sea to Tamar. And {this is the border on the east}.

Treasury of Scripture Knowledge

Summary

Then your south quarter shall be from the wilderness of Zin along by the coast of Edom, and your south border shall be the outmost coast of the salt sea eastward:

Bible References

South quarter

Exodus 23:31
" 'And I will set your boundary from the {Red Sea} and up to the sea of the Philistines and from [the] desert up to the river, because I will give the inhabitants of the land into your hand, and you will drive them out from before you.
Joshua 15:1
The allotment for the tribe of the descendants of Judah according to their families reached to the border of Edom, to the wilderness of Zin, {to the far south}.
Ezekiel 47:13
Thus says the Lord Yahweh: "This [is] the boundary [by] which you shall distribute the land for {the twelve} tribes of Israel: Two shares [shall be for] Joseph.

Salt sea eastward

Joshua 3:16
the waters flowing down from above stood [still]; they stood up [in] one heap very far from Adam, the city that [is] beside Zarethan, while [the waters] flowing down to the sea of the Arabah, the Salt Sea, {were completely cut off}; and the people crossed [over] opposite Jericho.
Joshua 15:2
Their southern border was from the end of the Salt Sea, from the bay facing southward;
Ezekiel 47:8
And he said to me, "These waters [are] going out to the eastern region, and they go down to the {Jordan Valley}, and they come [to] the sea [and flow] into the sea [where] {they issue out}, and the waters [in the sea] will be healed.