Mordor

A desolate land of grey ash plains and wastes in the southeast, surrounded by the Ash Mountains and the Mountains of Shadow. The entrance is Morannon and Isenmouthe. It contains Mount Doom and the Dark Tower.

It is populated by Orcs, Trolls and evil Men led by the Ringwraiths.

In the Second Age Numenoreans and Elves fought against Sauron who retreated to Mordor. Ar-Pharazon later mustered a great host and entered the heart of Mordor and demanded Sauron out from Barad-dur and Sauron surrendered and was taken to Numenor. He survived the destruction of Numenor and returned to Mordor. In the end of the Age, the Last Alliance entered Mordor and a final battle was fought at the gates of the Dark Tower.

In the Third Age Wizards allied with the Elves to drive Sauron from Dol Guldur and he simply returned to his old fortress in Mordor and raised the Dark Tower once again.

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