The Lonely Mountain
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.