Udûn originated with the creation of the lands 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.
Portrayal in adaptations
The Lord of the Rings film trilogy
Udûn appears in the third film of Peter Jackson's The Lord of the Rings film trilogy, while Frodo Baggins and Samwise Gamgee are traveling towards Mount Doom. The valley itself is depicted similarly to its description in J.R.R. Tolkien's works, though the apparent distances are altered in order for Barad-dûr to be visible from the Black Gate.
Middle-earth: Shadow of Mordor
In Middle-earth: Shadow of Mordor, following the Battle of Dagorlad, Udûn became populated by the Outcasts of Udûn, descendants of banished Gondorian criminals and slaves. They built a shanty town known as The Slabs in the eastern reaches of the valley. Upon Sauron's return to Mordor, the Outcasts were either enslaved or driven out of Udûn and their city was converted into Uruk's Hollow, a slave camp and home for Sauron's minions.
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