The desert known as the largest sand desert in the world is the Rub' al Khali, or the Empty Quarter, located on the Arabian Peninsula. It spans parts of Saudi Arabia, Oman, the UAE, and Yemen. Covering around 1,000 kilometers in length, this vast expanse of shifting sand dunes reaches heights of up to 250 meters. The harsh climate, limited rainfall, and extreme temperatures make it one of the most inhospitable places on Earth, yet it is home to unique adaptations in flora and fauna.