Mount Doom — Middle-earth Lore

Mount Doom, Orodruin in Sindarin, was the volcano on the plateau of Gorgoroth in north-western Mordor. In the Sammath Naur, the Chambers of Fire inside its cone, Sauron forged the One Ring about the year 1600 of the Second Age, and only there could the Ring be unmade. Isildur took the Ring from Sauron on its slopes in 3441 and would not cast it into the fire. Three thousand years later Frodo and Sam climbed it, and on 25 March 3019 the Ring fell into the Crack of Doom.

Kind: A fire-mountain on the plateau of Gorgoroth, in Mordor^1,2
Height: A base about 3,000 feet above the plain, and a cone half as high again¹
Within: The Sammath Naur, the Chambers of Fire, and the Crack of Doom¹
Forging: The One Ring, S.A. c. 1600^3,2
Woke again: T.A. 2954, three years after Sauron declared himself openly⁴
Unmaking: 25 March T.A. 3019^5,1

The fire of Orodruin

Sauron took Mordor for his own in the Second Age, a land walled by mountains on three sides, and built the Dark Tower of Barad-dûr in its north-west. A few leagues west of the tower stood the fire-mountain, and in its fire, in a chamber dug into its cone, he forged the One Ring.^2,3

The Ring was made there and could be unmade only there. Gandalf told Frodo so in Bag End, the first time he spoke of destroying it: the Ring could not be broken or melted by any fire Frodo had, or even by a dragon's, and only in the fire where it was made could it be destroyed.⁶

Isildur's refusal

At the end of the Second Age the Last Alliance besieged Barad-dûr for seven years, and in 3441 Sauron came out and fought on the slopes of Orodruin. There Gil-galad and Elendil fell, and Isildur cut the Ring from Sauron's hand with the shard of his father's sword.^2,3

Elrond told the Council that he had been there, and Círdan with him. They counselled Isildur to cast the Ring into the fire close by. He would not. He took it as weregild for his father and brother, and two years later it betrayed him to his death.⁷

But Isildur would not listen to our counsel.
— Elrond⁷

Amon Amarth

The mountain slept while its master was gone. When Sauron returned, it woke with him: the Silmarillion says that the Númenórean exiles, perceiving that Sauron had returned, named the mountain anew Amon Amarth, Mount Doom.²

In 2954 of the Third Age, three years after Sauron declared himself openly, Mount Doom burst into flame again, and the last people of Ithilien fled west over the Anduin.⁴

The climb

Frodo and Sam came to it across the plateau of Gorgoroth from the north-west, after the long march from Cirith Ungol in Orc-gear. They threw away everything they could spare. The Ring was so heavy on Frodo that by the end he could hardly walk.^8,1

At the foot of the mountain he could go no further. Sam, who knew he could not take the Ring from his master, took his master instead.¹

I can't carry it for you, but I can carry you and it as well.
— Sam¹

He carried Frodo up the steep lower slopes until they came on Sauron's own road, which climbed the mountain from the east to a door in the cone. As they went up it, Gollum fell on them. Frodo threw him off and spoke to him with a power Sam had not heard before: if Gollum touched him again, he would be cast into the Fire of Doom himself. Sam, left to deal with Gollum, raised his sword, and could not bring himself to strike.¹

The mountain, as Tolkien measured it

A side view drawn from the description in the chapter “Mount Doom”. Tolkien gave the mountain's size only by eye, through Sam's: a great base about three thousand feet high, and a cone half as high again. The heights here follow those words; the rest is a plain drawing, not a map.¹

Drag to turn, pinch or scroll to zoom. The numbers are the key's.

The plateau of Gorgoroth. A plain of ash and slag in the north-west of Mordor, which Frodo and Sam crossed to reach the mountain.^8,1
The base, rising, Sam judged, about three thousand feet above the plain.¹
The cone, half as high again above the base, like a vast chimney, with a jagged crater at its top.¹
Sauron's road, built out from Barad-dûr across the plain, climbing the eastern side of the mountain to the door.¹
The Sammath Naur, a dark door in the cone facing east towards the Dark Tower; inside, the Chambers of Fire and the Crack of Doom.¹
Frodo and Sam's climb. Sam carried Frodo up the lower slopes until they came on Sauron's road.¹
The crater. When the Ring was destroyed the mountain burst, and fire poured from it.^1,9

The Sammath Naur

The door led into a passage in the heart of the cone, where the fire of the mountain broke up through a great fissure in the floor: the Crack of Doom. It was the very heart of Sauron's realm, where his power was greatest, and the Ring at its strongest.¹

There Frodo stood at the edge and claimed the Ring for his own, and put it on. In the same moment Sauron knew him, and the Nazgûl, at the Black Gate, wheeled and flew towards the mountain. Gollum sprang at the unseen hobbit, bit the Ring from his finger, and dancing on the brink with it, stepped too far and fell.¹

The mountain burst. Barad-dûr crumbled, the Nazgûl, caught in the fire, were destroyed, and Frodo and Sam escaped to a hill of ash among the rivers of fire, where Gwaihir and his brothers Landroval and Meneldor found them, with Gandalf.^1,9

Why only there

The Council in Rivendell weighed everything else: hiding the Ring, sending it over the Sea, giving it to Tom Bombadil, casting it into the deeps. Each failed for the same reason, that sooner or later the Ring would come back to its maker. Only its unmaking would end the danger, and only the fire of its making could unmake it.⁷

Interpretation So the end of the quest was set before it began, and it was the one road Sauron never watched. He could imagine anyone taking the Ring and using it, but not anyone carrying it into his own land to throw it away.^7,10

Timeline

S.A. c. 1000Sauron settles in Mordor and begins Barad-dûr.³
S.A. c. 1600He forges the One Ring in the Sammath Naur.³
S.A. 3441Sauron overthrown on the slopes of Orodruin. Isildur refuses to destroy the Ring.^3,7
T.A. 2954Mount Doom bursts into flame again. The last people of Ithilien flee.⁴
T.A. 3019, 24 Mar.Frodo and Sam reach the foot of the mountain.⁵
T.A. 3019, 25 Mar.The Ring falls into the Crack of Doom. The mountain erupts.⁵

Names

Name	Language	Meaning
Orodruin	Sindarin	The fire-mountain: orod “mountain” and ruin “red flame”^2,11 Try it in the translator
Amon Amarth	Sindarin	“Mount Doom”: the name the Númenórean exiles gave it when Sauron returned²
Mount Doom	Westron (rendered in English)	The name in the common speech⁷ Try it in the translator
Sammath Naur	Sindarin	“The Chambers of Fire”, inside the cone¹
The Crack of Doom	Westron (rendered in English)	The fissure in the floor of the Sammath Naur¹

Questions readers ask

Why didn't the Eagles carry the Ring to Mount Doom?

The book does not discuss it. The Ring had to go secretly, and soon after the Company set out the Nazgûl took to the air on winged beasts; but no character ever proposes a flight.^7,12

Tolkien did say, of a proposed film script that used them freely, that the Eagles were a dangerous "machine", which he had used sparingly, and that this was the absolute limit of their credibility and usefulness.¹³

How big was Mount Doom?

Only Sam's estimate is given: a base about three thousand feet above the plain, with a cone half as high again, so about four and a half thousand feet in all above Gorgoroth. The figure above is drawn to those proportions.¹

On screen

Where the best-known adaptation departs from the books. Nothing in this section is evidence for the books themselves.

In Jackson's Return of the King, Frodo fights Gollum for the Ring at the edge of the Crack, and both go over; Frodo hangs from the brink and Sam pulls him up. In the book there is no struggle on the brink: Frodo falls to his knees at the edge of the chasm, Gollum bites off his finger, and, dancing with the Ring, steps too far and falls.^14,1

Sources

Citations name the chapter rather than the page, so they work in any edition. The colour of each note shows what kind of source it is.

Published story The Hobbit and The Lord of the Rings as Tolkien published them.
Appendices Tolkien's own appendices to The Lord of the Rings.
Edited posthumously The Silmarillion, Unfinished Tales and Tolkien's late writings on the Elder Days, assembled by Christopher Tolkien from his father's papers.
Tolkien's letters Tolkien explaining his own work. Authoritative on intent, but private and sometimes provisional.
Adaptation Films and other adaptations. Never evidence for the books.

Published story The Return of the King, Book VI, ch. 3, “Mount Doom”
Edited posthumously The Silmarillion, “Of the Rings of Power and the Third Age”
Appendices The Lord of the Rings, Appendix B, “The Second Age”
Appendices The Lord of the Rings, Appendix B, “The Third Age”
Appendices The Lord of the Rings, Appendix B, “The Great Years”
Published story The Fellowship of the Ring, Book I, ch. 2, “The Shadow of the Past”
Published story The Fellowship of the Ring, Book II, ch. 2, “The Council of Elrond”
Published story The Return of the King, Book VI, ch. 2, “The Land of Shadow”
Published story The Return of the King, Book VI, ch. 4, “The Field of Cormallen”
Published story The Return of the King, Book V, ch. 9, “The Last Debate”
Edited posthumously The Silmarillion, Appendix, “Elements in Quenya and Sindarin Names”
Published story The Fellowship of the Ring, Book II, ch. 9, “The Great River”
Tolkien's letters Letter 210, to Forrest J. Ackerman (1958)
Adaptation Peter Jackson's film trilogy (2001–2003), The Return of the King (2003)