From Tolkien Gateway
Nimbrethil was a region of birchwoods that lay in the land of Arvernien, on the northern shore of the Bay of Balar. Wood from the forests of Nimbrethil was used by Eärendil to construct his ship Vingilot.
- J.R.R. Tolkien, Christopher Tolkien (ed.), The Silmarillion, "Map of Beleriand and the Lands to the North"
- J.R.R. Tolkien, Christopher Tolkien (ed.), The Silmarillion, "Quenta Silmarillion: Of the Voyage of Eärendil and the War of Wrath"
- J.R.R. Tolkien, The Lord of the Rings, The Fellowship of the Ring, "Many Meetings"
- 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), p. 19