Mount Doom contains the Cracks of Doom in J.R.R. Tolkien’s The Lord of the Rings.
Known in Tolkien’s invented language Sindarin as Orodruin, Mount Doom is the volcano in Mordor where Sauron forged the One Ring. The Cracks of Doom, also called Sammath Naur, are the fiery chambers within the mountain where the Ring can be destroyed.
The location is crucial because the Ring cannot be destroyed by ordinary weapons. Its power is bound to the fires in which Sauron made it, making Mount Doom the only place where the Ring can be unmade.
Mount Doom is not the same as Mount Gundabad, a northern stronghold associated with orcs, or Mindolluin, the mountain beside Minas Tirith. In Tolkien’s geography, Mount Doom stands in Mordor near the eastern edge of Middle-earth and dominates the story’s final journey.