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|Location||Between Beleriand and Eriador|
|Realms||Belegost, Nogrod, and later realms like Thorin's Halls|
|Inhabitants||Dwarves (Broadbeams, Firebeards, and Longbeards)|
|Description||Great western mountain range|
|Other names||Ered Luin, Ered Lindon|
|Events||War of Wrath|
 Early history
In the early days of Arda after the fall of the Two Lamps, the Blue Mountains were formed as the Valar widened the Great Sea and thrust Middle-earth eastward to protect Valinor. The Blue Mountains lined up with the Grey Mountains of the southlands, forming the western wall of Arda. These two ranges lay parallel to the Red Mountains in the northeast and Yellow Mountains in the southeast that formed the eastern wall. At their northern end, a narrow gap separated the Blue Mountains from the Iron Mountains, which stretched across the entire north of Middle-earth.
In the First Age, the Blue Mountains were an unbroken line separating Eriador from Beleriand. Seven rivers flowed from its western side, and the land these rivers flowed through was known as Ossiriand. Later, when the Green-elves settled there, the land was called Lindon, and the mountains sometimes referred to as the Ered Lindon.
Sometime during the Years of the Trees two Dwarven Fathers awoke under Mount Dolmed and founded the two westernmost houses of the Dwarves (the Firebeards and Broadbeams). They subsequently built two great city-states, Nogrod and Belegost.
The Blue Mountains were ruined during the War of Wrath at the end of the First Age, and in the south central end of the range the sea broke through. The River Lhûn now flowed through the mountains to the Gulf of Lune. On the western side a small section of Lindon remained, and here the retreating Elves built the kingdom of Lindon, ruled by Ereinion Gil-galad, last High King of the Noldor.
The Dwarven cities of Nogrod and Belegost were also ruined when the mountains were broken, causing most of the Dwarves to migrate east to Khazad-dûm, leaving a remnant behind. By the Third Age however, the native Dwarves seemed to have largely moved to the Southern chain.[source?]
 Third AgeDurin's Folk who were exiled from their halls in Erebor by Smaug the Dragon who had driven them out. After the War of the Dwarves and Orcs, King Thráin II established his throne in the Northern range beyond the Little Lune river and later his son Thorin ruled after he went missing. During Thorin's reign many of the wandering Longbeards joined him in his halls and they became prosperous in a fashion. However, Erebor was retaken from Smaug by Thorin and company in T.A. 2941, and it can be assumed most if not all of Durin's folk relocated there.
 Portrayal in adaptations
- The Blue Mountains form the location of a fight between Dwarves and Drogoth.
2007: The Lord of the Rings Online:
- The Blue Mountains appear as the game's westernmost region, Ered Luin. Ered Luin is the beginner's region for the game's races, Elves and Dwarves. The region's storyline is based around a conflict with a rogue clan of Dwarves called the Dourhands and a tribe of Goblins living in the winding valleys of a region called Rath Teraig. Ered Luin is home to the cities of Thorin's Hall and Duillond, but also contain smaller outposts such as Gondamon and Celondim. Ered Luin is also home to the hostile Dourhand cities of Kheledul and the excavation of a long-lost city named Sarnur.
- Although the Blue Mountains do not appear in the game, they are mentioned by the Dwarf Grof. He tells the player that the Blue Mountains are prosperous, but that they lately find more iron than gold.
 See also
- ↑ J.R.R. Tolkien, Christopher Tolkien (ed.), The Shaping of Middle-earth, "V. The Ambarkanta: Of the Fashion of the World"
- ↑ J.R.R. Tolkien, The Lord of the Rings, Appendix A, "The Númenorean Kings", "Eriador, Arnor, and the Heirs of Isildur"
- ↑ J.R.R. Tolkien, "Words, Phrases and Passages in Various Tongues in The Lord of the Rings", in Parma Eldalamberon XVII (edited by Christopher Gilson), p. 66
- ↑ J.R.R. Tolkien, Christopher Tolkien (ed.), The Lost Road and Other Writings, "Part Three: The Etymologies", p. 370
- ↑ J.R.R. Tolkien, Christopher Tolkien (ed.), The Shaping of Middle-earth, p. 341
- ↑ The Lord of the Rings: War in the North, Prologue