Gomorrah

submersion, one of the five cities of the plain of Siddim (q.v.) which were destroyed by fire (Gen 10:19; 13:10; 19:24; 19:28). These cities probably stood close together, and were near the northern extremity of what is now the Dead Sea. This city is always mentioned next after Sodom, both of which were types of impiety and wickedness (Gen 18:20; Rom 9:29). Their destruction is mentioned as an "ensample unto those that after should live ungodly" (2Pet 2:6; Jude 1:4-7). Their wickedness became proverbial (Deut 32:32; Isa 1:9; 1:10; Jer 23:14). but that wickedness may be exceeded (Matt 10:15; Mark 6:11). (See DEAD SEA).

EBD - Easton's Bible Dictionary