Gorgoroth is a desert area in J.R.R. Tolkien's fictional land of Mordor.
It lies towards the north west of the land, between out-thrust arms of the Ered Lithui and Ephel Duath mountains. The name means 'Place of very great dead', which is rather apt, as the Dark Lord Sauron has his tower, Barad-dur located in the east of Gorgoroth.
Frodo Baggins and Sam Gamgee crossed this land on the way to Mount Doom, which lies about in the centre of this area.

Source :- My many readings of the Lord of The Rings, and the web site www.glyphweb.com/arda/default.htm