Irensaga was a mountain in the White Mountains, notable for its saw-toothed crest. In between Irensaga, Starkhorn and Dwimorberg there was Harrowdale.
It means "iron-saw" in Old English, with reference to its serrated ridge, crest.
In earlier versions of the legendarium Írensaga lacked an accent.
- ↑ 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