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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 Dwarf city in Middle-earth.

It was located northeast of Mirkwood, near the Grey Mountains, and was the source of the River Running.


Third Age

Durin's Folk discovered the mineral wealth of the Lonely Mountain during the Second Age, but the colony only came into its own after the fall of Khazad-dûm. In TA 1999 King Thráin I led his people there and became King under the Mountain. In time, they became very rich and amassed a large amount of gold and treasure which included the jewel known as the Arkenstone. Thráin I used the Arkenstone as a symbol of his rule, and his sons and grandsons under him who were to follow.

The Front Gate of Erebor as seen in The Hobbit: An Unexpected Journey

For two-hundred and eleven years the kingdom advanced, expanded and propsered until Thorin I abandoned it to join his kin in the Grey Mountains in TA 2210. The Lonely Mountain was abandoned for three-hundred and eighty years. However, the Dwarves of the Grey Mountains began to be attacked by the Dragons that still lived in those mountains, and became embroiled in a costly war against them, which forced the Dwarves to abandon the Grey Mountains in TA 2590. They went their separate ways: Grór and his followers settled in the Iron Hills, and Thrór with his followers went to the Lonely Mountain.[2]

Under Siege

Erebor became the lair and treasure-hoard of Smaug after he destroyed Dale and killed many of the Dwarves

While Thorin Oakenshield was out hunting one day in TA 2770, Smaug flew in from the northern mountains and attacked the Lonely Mountain. After laying waste to both Erebor and the neighbouring town of Dale, Smaug made the mountain his domain and hoarded the kingdom's wealth for himself. Thrór, his son Thráin and several companions escaped through a Side-door. For many years thereafter the Dwarves lived in exile first in Dunland and then the Blue Mountains. After a time Thráin II grew restless and set out with a band of companions in TA 2841 to return to the mountain. Thráin vanished one morning and the attempt was abandoned.

Then seemingly by chance, Gandalf met Thorin in Bree, where together they planned to reclaim the mountain.[3]

Quest for Erebor

In TA 2941, Bilbo Baggins and Thorin's company traveled to the Lonely Mountain to regain the treasure Smaug had stolen. Set into the side of the mountain was a secret door, five feet high and wide enough for three to walk through abreast. Gandalf had managed to obtain the door's key and a map to its location from Thráin II, which fit a keyhole which could be found only when the setting sun and the last moon of autumn (also known as Durin's Day) would shine their light upon the keyhole. It took many days to find the door, and luckily for Thorin and Company, they did arrive on Durin's Day and were able to enter the mountain.

Smaug was eventually slain, shot out of the sky by a well-aimed arrow at his only weak spot by Bard the Bowman, a man of Lake-town and a descendant of Girion, the last lord of Dale. He was later declared king of the restored Kingdom of Dale. Thorin thus reclaimed the mountain, but the elves of Mirkwood and men of Lake-town sought a part of the treasure, which Thorin refused to share. Dáin Ironfoot came to Thorin's aid, and the three races almost broke into war, until a host of Orcs and wolves attacked, eager to break the strength of all three kingdoms. Dwarves, elves, and men, together with the Eagles, battled the Orcs in what became known as the Battle of Five Armies. During the battle, Thorin was mortally injured, and the titles of King under the Mountain and King of Durin's Folk passed to Dáin.

War of the Ring

Battle of Dale

The demise of Smaug was not to be the last of the Lonely Mountain's many troubles. In TA 3019 on the 17th of March, a horde of Easterling soldiers from Rhûn swarmed over the Redwater river, opening up a new front in the northern theater of the War of the Ring. The Men of Dale fell back to the the protection of the Lonely Mountain.

Kings Brand and Dáin ready to defend their kingdoms

The dwarves and men fought a pitched battle against the invaders, in which Dáin and Brand, the then-King of Dale, were killed, though their forces eventually emerged victorious. The impenetrable gates and walls of the Lonely Mountain, buttressed and secured with advanced, complex, and resilient dwarven stonecraft and smithwork, easily withstood the siege equipment of the Easterlings. The many years spent improving the Lonely

The last resistance against the forces of Sauron

Mountain's defenses had paid off, and the Easterlings were unable to gain entry. Following the news of the destruction of the One Ring and the fall of Sauron, the Dwarves and Men of Dale sortied and routed the besieging army.

Fourth Age

As Dáin was killed during the War of the Ring, lordship of Erebor passed to his son Thorin III Stonehelm, who ruled well into the Fourth Age. During this time, Dwarves from the Lonely Mountain helped rebuild cities in Gondor and the fortress of the Hornburg, and some went to the newly established Dwarven colony in the Glittering Caves where Gimli was lord. Eventually an expedition was led from the mountain to reclaim the Longbeards' ancestral home of Khazad-dûm.

Portrayal in adaptations

The Hobbit film trilogy

Peter Jackson's The Hobbit trilogy (2012-2014) featured computer-generated shots of the Lonely Mountain, Dale, and other Dwarven cities.

Video games

Erebor in The Lord of the Rings Online

In The Lord of the Rings Online, after a minor appearance depicting the Siege of Erebor, Erebor proper was added in 2018 as part of Eryn Lasgalen and the Dale-lands. After the breaking of the siege, it is now ruled by King Thorin III Stonehelm who must deal with some of the enemy's army still remaining near his lands. Other than the main hall of Erebor, players can also visit the living quarters, the burial tombs as well as several hidden chambers within the Mountain.



Foreign Language Translated name
Afrikaans Eensame Berg
Albanian Mal i Vetmuar
Arabic الجبل الوحيد
Armenian Միայնակ լեռ
Azerbaijani Tənha Dağ
Belarusian Cyrillic Адзінокая Гара (Lonely Mountain) Эрэбар (Erebor)
Bengali লোনলি মাউন্টেন
Bosnian Usamljena planina
Bulgarian Cyrillic Самотна планина (Lonely Mountain) Еребор (Erebor)
Burmese အထီးကျန်တောင်ကြီးတောင်ငယ်
Cambodian ភ្នំឯកោ
Cebuano Mingaw nga bukid
Chinese (Continental) 孤山
Chinese (Hong Kong) 孤山
Catalan Muntanya Solitària
Croatian Usamljena planina
Czech Osamělá hora
Danish Det Ensomme Bjerg
Dutch (Netherlands And Belgian) Eenzame Berg
Esperanto Soleca Monto
Estonian Üksildane Mägi
Basque Mendi Bakartia
Filipino Nag-iisang Bundok
Finnish Yksinäinen vuori
French Mont Solitaire
Frisian Iensume Berch
Galician Montaña Solitaria
Georgian ეული მთა (Lonely Mountain) ერებორი (Erebor)
German Einsamer Berg
Greek Μοναχικό Βουνό
Gujarati લોન્લી માઉન્ટેન
Hawaiian Mehameha Mauna
Hebrew (Erebor) רבור (Lonely Mountain) ההר הבודד
Haitian Creole Mòn sèl
Hindi सुुनसान पर्वत
Hmong Roob kho siab
Hungarian Magányos Hegy
Icelandic Einmanna fjall
Indonesian Gunung Sunyi
Irish Gaelic Sliabh Uaigneach
Italian Montagna Solitaria
Japanese 孤独な山 (Lonely Mountain) エレボール (Erebor)
Kannada ಲೋನ್ಲಿ ಮೌಂಟೇನ್
Kazakh жалғыз тау (Cyrillic) Jalğız taw (Latin)
Korean 외로운 산/에레보르 (Lonely Mountain) 에레보르 (Erebor)
Kurdish Çiya bi tenę (Kurmanji)
Kyrgyz Cyrillic жалгыз тоо
Laotian ພູເຂົາເປົ່າປ່ຽວດຽວດາຍ
Latin Mons Solus
Latvian Vientuļais Kalns
Lithuanian Vienišąjį Kalną
Macedonian Cyrillic Осамена Планина
Maori Maunga Mokemoke
Malaysian Gunung Sepi
Maltese Solitarju Muntanja
Marathi एकाकी डोंगरावर
Mongolian Cyrillic ганцаардаж уулын
Nepalese एक्लो पहाड
Norwegian Ensomfjellet
Occitan Montanha Solitària
Persian اره بور (Erebor) کوه تنهایی (Lonely Mountain)
Polish Samotna Góra
Portuguese (Brazil and Portugal) Montanha Solitária
Punjabi ਇਕੱਲੇ ਪਹਾੜੀ
Romanian Muntele Singuratic
Romansh Muntogna Solitari
Russian Одинокая Гора
Scottish Gaelic Aonaranach Bheinn
Serbian Самотна планина (Cyrillic) Samotna planina (Latin)
Slovenian Osamljena Gora
Slovak Osamelú horu
Shona Shurikirwa Gomo
Sindhi اڪيلو جبل
Sinhalese හුදකලා ගිරිය
Somalian Cidlo Buurta
Spanish Montaña Solitaria
Swedish Ensamma Berget
Tajik Cyrillic бекас Маунтин
Tamil லோன்லி மலை
Telugu లోన్లీ మౌంటైన్
Thai ภูเขาโลนลี่ (Lonely Mountain) เอเรบอร์ (Erebor)
Turkish Yalnız dağ
Ukrainian Cyrillic Самотня гора (Lonely Mountain) Еребор (Erebor)
Urdu تنہا پہاڑ
Uzbek Лонелй Моунтаин (Cyrillic) Yolg'iz tog ' (Latin)
Vietnamese Ngọn Cô Độc
Welsh Mynydd Unig
Yiddish עלנט באַרג
Dwarven Realms of Middle-earth throughout the Ages
Years of the Trees Amon Rûdh | Belegost | Khazad-dûm | Mount Gundabad | Nogrod | Nulukkizdîn | Blue Mountains
First Age Amon Rûdh | Belegost | Khazad-dûm | Mount Gundabad | Nogrod | Nulukkizdîn | Iron Hills | Blue Mountains
Second Age Khazad-dûm | Belegost | Nogrod | Mount Gundabad | Blue Mountains | Iron Hills
Third Age Grey Mountains | Iron Hills | Khazad-dûm | Lonely Mountain | Blue Mountains | Dunland
Fourth Age Glittering Caves | Khazad-dûm | Lonely Mountain | Blue Mountains | Grey Mountains | Iron Hills


  1. 1.0 1.1 The Lord of the Rings, Appendix B: The Tale of Years (Chronology of the Westlands), "The Second Age"
  2. The Lord of the Rings, Appendix A, "Durin's Folk"
  3. Unfinished Tales, Part Three: The Third Age, Chapter Three: "The Quest of Erebor"