Nunduinë was a river of Númenor, the second longest after the Siril. It flowed westward out of the central regions of the island, and as it approached the sea, its waters spread to form the fragrant lake of Nísinen. Its mouth was at the haven of Eldalondë, on the shores of the Bay of Eldanna.
- J.R.R. Tolkien, Christopher Tolkien (ed.), Unfinished Tales, "A Description of the Island of Númenor"
- J.R.R. Tolkien, Christopher Tolkien (ed.), Unfinished Tales, "[Map of] Númenórë"
- J.R.R. Tolkien, "Eldarin Hands, Fingers & Numerals and Related Writings — Part Two" (edited by Patrick H. Wynne), in Vinyar Tengwar, Number 48, December 2005, p. 31