Mount Doom is the volcano where the One Ring was forged in J.R.R. Tolkien’s The Lord of the Rings.
Mount Doom is the common name for Orodruin, a volcanic mountain in Mordor. Sauron forged the One Ring in its fires during the Second Age, using the mountain’s destructive power to bind much of his own strength to the Ring. Because the Ring could be destroyed only in the fire where it was made, Mount Doom becomes the destination of Frodo and Sam’s quest.
The mountain is also called Amon Amarth, meaning “Mount Doom” in Sindarin. It stands near Barad-dûr and dominates the final stage of the journey across Mordor. Frodo reaches the Cracks of Doom inside the volcano, where Gollum’s actions ultimately cause the Ring to fall into the fire.
Mount Doom should not be confused with other Tolkien mountains such as Mount Gundabad or Caradhras. Those locations are important elsewhere in Middle-earth but did not forge the One Ring.