- For other uses of Udûn see: Udûn.
Udûn originated with the creation of Mordor. During both the war of the Last Alliance and the War of the Ring, the vast armies of Mordor passed through here and out the Black Gate to confront their enemies.
- ↑ 1.0 1.1 The Atlas of Middle-earth, Regional Maps, "Mordor (and Adjacent Lands)"
- ↑ 2.0 2.1 2.2 The Complete Guide to Middle-earth