The cavern or tunnel made by Sauron, also called the Chambers of Fire, that led into the cone of Orodruin, Mount Doom in the heart of Mordor. It was reached by a road that wound around the Fiery Mountain until it reached a door high up on the eastern side, looking towards Barad-dûr across the plain of Gorgoroth. Inside, the Chambers led into darkness, lit only by a narrow chasm from which leapt Orodruin's Fire, the chasm known as the Cracks of Doom.
It was in the chambers of the Sammath Naur that Sauron had forged the One Ring in the Second Age, and it was impervious to any power other than the Fire of its birth. So, at the end of the Third Age, Frodo Baggins and Sam Gamgee brought the Ring secretly back to the Sammath Naur, and caused it to be cast back into the Cracks of Doom. The Ring was destroyed, and Sauron's Chambers of Fire were also shattered as Orodruin tore itself apart.
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