The area below Orodruin known as Gorgoroth all the way to Minas Morgul and Morannon on one side and Barad Dur on the other, better known as the Black Tower.
In the northwest, the pass of Cirith Gorgor led into the enclosed plain of Udûn. Sauron built the Black Gate of Mordor (the Morannon) across the pass. This added to the earlier fortifications, the Towers of the Teeth – Carchost to the east, Narchost to the west, guard towers which had been built by Gondor to keep a watch on this entrance. The passage through the inner side of Udûn into the interior of Mordor was guarded by another gate, the Isenmouthe. Outside the Morannon lay the Dagorlad or Battle Plain, and the Dead Marshes..
Our only job is to drink beer, have fun and grind so our lord Sauron can rise again..