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Matěj Čadil - Aros.jpg
Physical Description
LocationFlowing from Himlad around Doriath to the Sirion
General Information
EtymologyD. ar "bloody red"[source?]

Aros was a river of East Beleriand that arose in the northern lands west of the Pass of Aglon. It flowed south between Dor Dínen and Himlad (between these two lands the river could be crossed at Arossiach). The river's course then followed the eastern and southern boundaries of the Forest of Region (and thus formed much of the border of the Kingdom of Doriath) before it met the Sirion at Aelin-uial. Its one main tributary was the River Celon.[1]


The word Aros, derived from the Elvish root YAR- ("blood"), is said to be a "name of river with reddish water". The Noldorin form of the word was iaros.[2]


  1. J.R.R. Tolkien, Christopher Tolkien (ed.), The Silmarillion, "Map of Beleriand and the Lands to the North"
  2. J.R.R. Tolkien, Christopher Tolkien (ed.), The Lost Road and Other Writings, "Part Three: The Etymologies", p. 400