The "Lonely Mountain," a massive peak located in the northeast of Middle-earth. It became the greatest kingdom of the Dwarves after the fall of Moria. It was the site of the Quest of Erebor, where Bilbo Baggins and a company of Dwarves led by Thorin Oakenshield reclaimed the mountain from the dragon Smaug. The reclaiming of Erebor was a turning point in the north, leading to the restoration of the Kingdom under the Mountain and providing a crucial stronghold during the later wars against Sauron.