Rub' al Khali
The Rub' al Khali (/ ˈ r ʊ b æ l ˈ k ɑː l i /; Arabic: ٱلرُّبْع ٱلْخَالِي (/ʕ alxaːliː/), the "Empty Quarter") is the sand desert encompassing most of the southern third of the Arabian desert covers some 650,000 km 2 (250,000 sq mi) (the area of long. 44°30′−56°30′E, and lat. 16°30′−23°00′N) including parts of Saudi Arabia, Oman ...