Nan Ungol first appeared on Daniel Reeve's map used for The Lord of the Rings: The Return of the King merchandise.[note 1] In Middle-earth: Shadow of Mordor it is mentioned that while some of Shelob's children, traveling south, have
taken Nan Ungol (Sindarin for "Valley of the Spiders") as their primary home, they've since spread across Mordor taking residence in its caves and other dark places, and are actively reporting back to their queen.
There, it is said that "Their nests and lairs are littered with the crushed bones of their prey" and none who enter this valley come back alive.
Gallery
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2003 merchandise map