Tolkien Gateway

Thorn Sir

Thorn Sir ("Eagle-stream") was a river at the bottom of a gorge in the Encircling Mountains into which Glorfindel and the balrog fell. After this battle the river was stained black by the balrog's blood for many days.[1] This river is only mentioned in the early Lost Tale of the Fall of Gondolin and is never mentioned in any other writing of Tolkien.


  1. J.R.R. Tolkien, Christopher Tolkien (ed.), The Book of Lost Tales Part Two, "III. The Fall of Gondolin", pp. 192-194