Rub' al Khali

The Rub' al Khali, or the Empty Quarter, is a mentioned only location.

Background
The location contained the ruins of Ubar, an ancient city that predates Human civilization by at least 4,000 years. Lorenzo Cabot traveled here to find the city in 1894, and what he discovered caused his hired hands to flee.

Appearances
The Rub' al Khali is mentioned only in Fallout 4.

Behind the scenes
The Rub' al Khali is a real world desert, encompassing most of the southern third of the Arabian Peninsula.