|Location||North of the Dwimorberg over looking the Firienfeld|
|Belongs to||The White Mountains|
|Events||Arrival of King Théoden at Dunharrow|
Írensaga was a tall peak in the White Mountains, notable for its saw-toothed crest. In between Írensaga, Starkhorn and Dwimorberg there was Harrowdale. Merry saw this mountain on 9 March T.A. 3019 when King Théoden came to Dunharrow after the Battle of the Hornburg.
In earlier versions of the legendarium Írensaga lacked an accent.
- J.R.R. Tolkien, The Lord of the Rings, The Return of the King, "The Muster of Rohan"
- J.R.R. Tolkien, The Lord of the Rings, Appendix B, "The Great Years"
- J.R.R. Tolkien, Christopher Tolkien (ed.), The War of the Ring, "Part Three: Minas Tirith", "V. Many Roads lead Eastward (2)"
- J.R.R. Tolkien, "Nomenclature of The Lord of the Rings" in Wayne G. Hammond and Christina Scull (eds), The Lord of the Rings: A Reader's Companion, p. 772