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Destroyed at the end of the First Age
Flowing southward out of Ered Gorgoroth, and then westward to form the eastern and southern boundaries of Doriath
In the eastern foothills of the Ered Gorgoroth
Celon, and one other lesser river, unnamed, near Aros' source
Into Sirion above that river's Fens
'Bloody', referring to its reddish colour1


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  • Updated 17 June 2015
  • Updates planned: 1

River Aros

The southern border-river of Doriath

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Map of the River Aros

A river of eastern Beleriand that rose in the eastern mountains of Ered Gorgoroth, and flowed into the Sirion at Aelin-uial.



According to The Etymologies in volume 5 of The History of Middle-earth, the name Aros derived from Sindarin iaros, 'bloody', because of the distinctive reddish hue of its water. This mirrors the name of another river much farther to the east, the Carnen or Redwater. The Carnen's reddened water was due to its source in the Iron Hills (iron deposits give rise to reddish river water) and so presumably Aros' source in the Ered Gorgoroth was similarly associated with deposits of iron.

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