Sodom

burning; the walled, a city in the vale of Siddim (Gen 13:10 ; 14:1-16). The wickedness of its inhabitants brought down upon it fire from heaven, by which it was destroyed (Gen 18:16 -33; 19:1-29; Deut 23:17 ). This city and its awful destruction are frequently alluded to in Scripture (Deut 29:23 ; 32:32; Isa 1:9 ; 1:10; 3:9; 13:19; Jer 23:14 ; Ezek 16:46 -56; Zeph 2:9 ; Matt 10:15 ; Rom 9:29 ; 2Pet 2:6 ), etc. No trace of it or of the other cities of the plain has been discovered, so complete was their destruction. Just opposite the site of Zoar, on the south-west coast of the Dead Sea, is a range of low hills, forming a mass of mineral salt called Jebel Usdum, "the hill of Sodom." It has been concluded, from this and from other considerations, that the cities of the plain stood at the southern end of the Dead Sea. Others, however, with much greater probability, contend that they stood at the northern end of the sea. [in 1897]

EBD - Easton's Bible Dictionary