It rose from the Pools of Ivrin in the Ered Wethrin, flowed south and then southeast, flowing through a gorge in a series of rapids where it crossed the hills of the Andram or Long Wall, finally meeting Sirion in the Land of Willows Nan-tathren, not far above the Mouths of Sirion. Narog's tributaries were the River Ginglith in the north and the River Ringwil in the Taur-en-Faroth.
In the Etymologies, the river's name was stated to mean "rushing, violent". However, in a later writing by Tolkien, the Sindarin name Narog was given two possible Khuzdul origins: Narâg and naruka, both of unknown meaning.
- ↑ J.R.R. Tolkien, Christopher Tolkien (ed.), The Lost Road and Other Writings, "Part Three: The Etymologies"
- ↑ J.R.R. Tolkien, "Words, Phrases and Passages in Various Tongues in The Lord of the Rings", in Parma Eldalamberon XVII (edited by Christopher Gilson), pp. 37, 47
- ↑ J.R.R. Tolkien, Christopher Tolkien (ed.), The Shaping of Middle-earth, "III. The Quenta: Appendix 1: Fragments of a translation of The Quenta Noldorinwa into Old English, made by Ælfwine or Eriol; together with Old English equivalents of Elvish names"