The Lonely Mountain, known in Sindarin as Erebor, referred to both a mountain in northern Rhovanion and the subterranean Dwarven city contained within it. In the latter half of the Third Age, it became the greatest city in Middle-earth.
The Lonely Mountain! Bilbo had come far and through many adventures to see it, and now he didn't like the look of it in the least.
by GoDoSomethingProductive March 31, 2021