6. The Rub ‘al Khali, Arabian Peninsula
The Rub ‘al Khali is world’s largest sand desert that stretches for about 250,00 square miles, covering parts of Oman, Saudi Arabia, Yemen and the UAE, that’s one-third of the Arabian Peninsula. Incredible! The red/orange dunes reach more than 800 feet in places, and due to the lack of water and searing heat, there’s minimal wildlife. Moreover, the Rub ‘al Khali is one of the most oil-rich places in the world.