What is the name of the mountain where the One Ring was forged?

The One Ring was forged in Mount Doom.

Mount Doom is the volcanic mountain in Mordor where Sauron secretly forged the One Ring during the Second Age. Its Sindarin names include Orodruin, “Mountain of Blazing Fire,” and Amon Amarth, “Mount Doom.” The volcano was closely tied to Sauron’s power and became the symbolic heart of his realm.

Mount Doom was not merely the place where the Ring was made; its fiery interior was also the only location capable of destroying it. That is why the Fellowship’s mission required Frodo and Sam to travel all the way into Mordor rather than attempting to break or melt the Ring elsewhere. The Ring was ultimately destroyed when Gollum fell into the Cracks of Doom while clutching it.

Erebor is the Lonely Mountain and Smaug’s stronghold. Mindolluin stands behind Minas Tirith, while Caradhras is one of the peaks of the Misty Mountains. In Peter Jackson’s films, Mount Ngauruhoe and Mount Ruapehu in New Zealand helped portray its volcanic landscape.