Admah (or Adamah - earth) was one of the pentapolis of the Vale of Siddim. It was destroyed along with Sodom and Gomorrah. It is supposed by some to be the same as the "Adam" of Joshua 3:16. The location of Admah is unknown.
This article incorporates text from a publication now in the public domain: Easton, Matthew George (1897). "". Easton's Bible Dictionary (New and revised ed.). T. Nelson and Sons.