The Ered Luin or Blue Mountains, also known as Ered Lindon, is the mountain range at the far west of Eriador, in J. R. R. Tolkien's fictional world of Middle-earth. Eriador is a large region in J. R. R. Tolkiens fictional world of Middle-earth. ... J. R. R. Tolkien in 1916, wearing his British Army uniform in a photograph from the middle years of WW1. ... A map of the Northwestern part of Middle-earth at the end of the Third Age, courtesy of the Encyclopedia of Arda. ...

During the First Age, the Ered Luin was an unbroken line separating Eriador from Beleriand. Seven rivers arose in it on the western side, and the land these rivers flowed through was known as Ossiriand, and later also as Lindon, therefore the mountains were sometimes referred to as the Ered Lindon. The dwarven cities of Belegost and Nogrod were located in this range. In the fiction of J. R. R. Tolkien, the First Age began with the rise of the Sun and the arrival of the Ñoldor in the land Beleriand in Middle-earth, and ended with the overthrow of Morgoth. ... In the fiction of J. R. R. Tolkien, Beleriand was the region of northwestern Middle-earth during the First Age. ... Spoiler warning: In the fiction of J. R. R. Tolkien, Lindon is the land beyond the Ered Luin (Blue Mountains) in the northwest of Middle-earth. ... The Dwarves of J. R. R. Tolkiens fictional universe of Middle-earth are beings of short stature, often friendly with Hobbits although long suspicious of Elves. ... In J. R. R. Tolkiens fictional universe of Middle-earth, Belegost was one of two Dwarven cities in the Ered Luin. ... In J. R. R. Tolkiens fictional universe of Middle-earth, Nogrod was one of two Dwarven cities in the Ered Luin. ...

The mountain range was broken during the war of the Valar against Morgoth, and at the middle of the range the sea broke through, creating a new terminus for the river Lhûn. In the middle of the gap, where the Lhûn met the sea, the Grey Havens of Mithlond of the Elven Kingdom of Lindon were built. When seen as the border of Lindon the Ered Luin were called Ered Lindon. In J. R. R. Tolkiens fantasy universe, Middle-earth, the Valar are the Powers of Arda who live on the Western continent of Aman. ... Morgoth Bauglir (Morgoth means The Dark Enemy, Bauglir is The Constrainer), originally named Melkor (He Who Arises in Might), is a fictional character of Middle-earth, created by J. R. R. Tolkien. ... The Mithlond or the Grey Havens was a haven (seaport) on the Gulf of Lune in the northwest of J. R. R. Tolkiens fictional world of Middle-earth. ... Spoiler warning: In the fiction of J. R. R. Tolkien, Lindon is the land beyond the Ered Luin (Blue Mountains) in the northwest of Middle-earth. ...

During the creation of Arda, the Blue Mountains were meant to line up directly with the Grey Mountains of the southlands, forming the western wall of Middle-earth, just like the Red Mountains (or Orocarni) and Yellow Mountains formed the eastern wall. The range of the Blue Mountains was originally connected with the Red Mountains by the Ered Engrin or Iron Mountains. But this symmetry of Arda was broken during the wars before the Years of the Lamps. A map of Arda before the end of the First Age, courtesy of the Encyclopedia of Arda In the works of J. R. R. Tolkien, Arda is the world in which all of the events occur, including the continents of Middle-earth and Aman. ... In J. R. R. Tolkiens fictional universe of Middle-earth, the Orocarni was a mountain range in the far east. ... In J. R. R. Tolkiens fictional universe of Middle-earth, the Iron Mountains or Ered Engrin were an immense mountain range in the north. ... In the fiction of J. R. R. Tolkien, the Years of the Lamps are one of the three great time-periods of Arda. ...