Mount Doom is the mountain where the One Ring was forged and destroyed in J.R.R. Tolkien’s Middle-earth.
Known in Tolkien’s languages as Orodruin, Mount Doom is a volcanic peak in Mordor. Sauron uses its fires to forge the One Ring, making the mountain uniquely capable of undoing the object that concentrates his power.
Frodo and Sam travel across Mordor to reach the Cracks of Doom inside the mountain. Frodo claims the Ring at the final moment instead of willingly throwing it away, but Gollum bites off Frodo’s finger and then falls into the fire while holding the Ring. Its destruction causes Sauron’s power to collapse.
Mount Doom is not merely a dangerous landmark. It represents the close link between Sauron’s power and the Ring’s physical substance. Caradhras, another famous mountain in the story, is associated with the Fellowship’s failed attempt to cross the Misty Mountains, not with the Ring’s creation or destruction.