Bible Meaning: Not found in Scripture
Although the name "Dead Sea" is not found in the KJV Bible, this large body of water is referred to as the "salt sea" (Strong's #H4417, #H3220) or the "sea of the plain (desert)" (#H4417, #H6160) in the Old Testament. The lake, primarily fed by the Jordan River, was usually used to demark various borders and boundaries in Scripture.
In modern times, the Dead Sea is 1,412 feet (430 meters) below sea level, making it the lowest elevation of land in the world.
The Dead Sea, located in a relatively hot desert climate with no natural outlet, evaporates quickly. The amount of salt left behind by this evaporation process causes the remaining water to be almost ten times saltier than the ocean! The density of salt is so high that it allows people to seemingly float in the water. It also makes it virtually impossible for animal or plant life to flourish.
A prophecy recorded in Ezekiel 47:7 - 10 seems to indicate that, in the future, God will heal the Dead Sea and allow it to support a multiple of fish and other life.
Genesis 14:1 - 3
And it came to pass in the days of Amraphel king of Shinar, Arioch king of Ellasar, Chedorlaomer king of Elam, and Tidal king of nations;
That these made war with Bera king of Sodom, and with Birsha king of Gomorrah, Shinab king of Admah, and Shemeber king of Zeboiim, and the king of Bela, which is Zoar. All these were joined together in the vale of Siddim, which is the salt sea.
Numbers 34:3, 12
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 . . .
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.
The plain also, and Jordan, and the coast thereof, from Chinnereth even unto the sea of the plain, even the salt sea, under Ashdothpisgah eastward.
That the waters which came down from above stood and rose up upon an heap very far from the city Adam, that is beside Zaretan: and those that came down toward the sea of the plain, even the salt sea, failed, and were cut off: and the people passed over right against Jericho.
And from the plain to the sea of Chinneroth on the east, and unto the sea of the plain, even the salt sea on the east, the way to Bethjeshimoth: and from the south, under Ashdothpisgah:
Joshua 15:2, 5
And their south border was from the shore of the salt sea, from the bay that looketh southward . . .
And the east border was the salt sea, even unto the end of Jordan. And their border in the north quarter was from the bay of the sea at the uttermost part of Jordan.
And the border passed along to the side of Bethhoglah northward: and the outgoings of the border were at the north bay of the salt (Dead) sea at the south end of Jordan: this was the south coast.