Saudi Arabia/Oman/Yemen/United Arab Emirates
Rub’ al Khali is the biggest sand desert worldwide, covering over 650,000 square kilometers. The desert, known as The Empty Quarter, spreads over Saudi Arabia, Oman, Yemen and the United Arab Emirates. The picture from above shows the centre of the region, where once used to be shallow lakes.
Photo: Benjamin Grant / Daily Overview / Amphoto Books / DigitalGlobe