Numbers 34:3

then your south quarter shall be from the wilderness of Zin along by the side of Edom, and your south border shall be from the end of the Salt Sea eastward;

Genesis 14:3

All these joined together in the vale of Siddim (the same is the Salt Sea).

Ezekiel 47:13

Thus saith the Lord Jehovah: This shall be the border, whereby ye shall divide the land for inheritance according to the twelve tribes of Israel: Joseph'shall have two portions.

Exodus 23:31

And I will set thy border from the Red Sea even unto the sea of the Philistines, and from the wilderness unto the River: for I will deliver the inhabitants of the land into your hand: and thou shalt drive them out before thee.

Joshua 3:16

that the waters which came down from above stood, and rose up in one heap, a great way off, at Adam, the city that is beside Zarethan; and those that went down toward the sea of the Arabah, even the Salt Sea, were wholly cut off: and the people passed over right against Jericho.

Joshua 15:1-12

And the lot for the tribe of the children of Judah according to their families was unto the border of Edom, even to the wilderness of Zin southward, at the uttermost part of the south.

Ezekiel 47:8

Then said he unto me, These waters issue forth toward the eastern region, and shall go down into the Arabah; and they shall go toward the sea; into the sea'shall the waters go which were made to issue forth; and the waters shall be healed.

Ezekiel 47:18-23

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

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 thy border from the Red Sea even unto the sea of the Philistines, and from the wilderness unto the River: for I will deliver the inhabitants of the land into your hand: and thou shalt drive them out before thee.
Joshua 15:1
And the lot for the tribe of the children of Judah according to their families was unto the border of Edom, even to the wilderness of Zin southward, at the uttermost part of the south.
Ezekiel 47:13
Thus saith the Lord Jehovah: This shall be the border, whereby ye shall divide the land for inheritance according to the twelve tribes of Israel: Joseph'shall have two portions.

Salt sea eastward

Joshua 3:16
that the waters which came down from above stood, and rose up in one heap, a great way off, at Adam, the city that is beside Zarethan; and those that went down toward the sea of the Arabah, even the Salt Sea, were wholly cut off: and the people passed over right against Jericho.
Joshua 15:2
And their south border was from the uttermost part of the Salt Sea, from the bay that looketh southward;
Ezekiel 47:8
Then said he unto me, These waters issue forth toward the eastern region, and shall go down into the Arabah; and they shall go toward the sea; into the sea'shall the waters go which were made to issue forth; and the waters shall be healed.

American Standard Version Public Domain