Genesis 14:10

And the vale of Siddim [was full of] slimepits [asphalt pits]; and the kings of Sodom and Gomorrah fled, and fell there; and they that remained fled to the mountain.

Genesis 14:8

And there went out the king of Sodom, and the king of Gomorrah, and the king of Admah, and the king of Zeboiim, and the king of Bela (the same [is] Zoar;) and they joined battle with them in the vale of Siddim;

Genesis 14:3

All these were joined together in the vale [valley] of Siddim, which is the salt sea.