All of this latter group of kings allied together in the Valley of Siddim (that is, the Salt Sea).

Then the kings of Sodom, Gomorrah, Admah, Zeboiim, and Bela (which was also known as Zoar) prepared for battle in the Valley of Siddim

Now the Valley of Siddim was full of tar pits, so when the kings of Sodom and Gomorrah fled, some of their people fell into them, while the rest fled to the hill country.