In J. R. R. Tolkien's fictional continent of Middle-earth, Mordor is the realm and base of the evil lord Sauron. It lay to the east of Gondor and the great river Anduin, and to the south of Mirkwood. From Wikipedia
Warner Bros. confirms the long-awaited Lord of the Rings prequel, reuniting the original creative team and exploring Gollum's untold story.