Aros
Aros was a river of East Beleriand that formed much of the border of the Kingdom of Doriath.
It arose in the northern lands west of the Pass of Aglon in the Shadowy Spring, and 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, turning west, the southern boundaries of the Forest of Region; at that point it was joined by its main tributary, Celon. Aros then met the Sirion at Aelin-uial.
Other versions of the legendarium
In The Book of Lost Tales, river Aros was flowing south of Artanor (Doriath). Near its spring it was passing the caves of the Rodothlim (Nargothrond), but this was soon changed to Narog.
Etymology
Referencias
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