Uin was a great whale in the service of Ulmo, who he used to drag Tol Eressëa towards Valinor in the earlier versions of the legendarium. Uin also pulled Ulmo's fishy cart. Uin does not appear in any later version of the legendarium, and his role seems to have been merged with Ulmo himself.
- ↑ J.R.R. Tolkien, Christopher Tolkien (ed.), The Book of Lost Tales Part One
- ↑ J.R.R. Tolkien, Christopher Tolkien (ed.), The Book of Lost Tales Part One, Appendix: Names in the Lost Tales – Part One
- ↑ J.R.R. Tolkien, "I-Lam na-Ngoldathon: The Grammar and Lexicon of the Gnomish Tongue", in Parma Eldalamberon XI (edited by Christopher Gilson, Arden R. Smith, and Patrick H. Wynne)