The Wasteland (The Test of Time Supplement)
From D&D Wiki
A cruel and unforgiving place, for a cruel and unforgiving race
Incredibly hot and dry, this plane draws the life out of it's inhabitants at incredible rates, the combination between incredibly hot, dusty and lifeless. Orcs rule this plane and have done so for centuries before they learned how to travel to the other planes.
Meta-game description: endless desert filled with terrible monsters and bloodthirsty religious zealots combined