The Rub' al Khali ( ar-Rubʿ al-Ḫālī, "Empty Quarter") is the largest contiguous sand desert (erg) in the world, encompassing most of the southern third of the Arabian Peninsula. The desert covers some (the area between long. 44°30′−56°30′E, and lat. 16°30′−23°00′N) including parts of Saudi Arabia, Oman, the United Arab Emirates, and Yemen. It is part of the larger Arabian Desert.