Numbers 34:12

and the [eastern] boundary shall go down to the Jordan [River], and its limit shall be at the Salt (Dead) Sea. This shall be your land according to its boundaries all around.’”

Numbers 34:3

your southern region shall be from the Wilderness of Zin along the side of Edom, and your southern boundary from the end of the Salt (Dead) Sea eastward.

Genesis 13:10

So Lot looked and saw that the valley of the Jordan was well watered everywhere—this was before the Lord destroyed Sodom and Gomorrah; [it was all] like the garden of the Lord, like the land of Egypt, as you go to Zoar [at the south end of the Dead Sea].

Genesis 14:3

All of these [kings] joined together [as allies] in the Valley of Siddim (that is, the Sea of Salt).

Genesis 19:24-26

Then the Lord rained down brimstone (flaming sulfur) and fire on Sodom and on Gomorrah from the Lord out of heaven,

Treasury of Scripture Knowledge

Summary

And the border shall go down to Jordan, and the goings out of it shall be at the salt sea: this shall be your land with the coasts thereof round about.

General references

Bible References

The salt sea

Numbers 34:3
your southern region shall be from the Wilderness of Zin along the side of Edom, and your southern boundary from the end of the Salt (Dead) Sea eastward.
Genesis 13:10
So Lot looked and saw that the valley of the Jordan was well watered everywhere—this was before the Lord destroyed Sodom and Gomorrah; [it was all] like the garden of the Lord, like the land of Egypt, as you go to Zoar [at the south end of the Dead Sea].
Genesis 14:3
All of these [kings] joined together [as allies] in the Valley of Siddim (that is, the Sea of Salt).
Genesis 19:24
Then the Lord rained down brimstone (flaming sulfur) and fire on Sodom and on Gomorrah from the Lord out of heaven,

General references

Joshua 15:5
The eastern border was the Salt (Dead) Sea, as far as the mouth of the Jordan. The northern border was from the bay of the sea at the mouth of the Jordan.