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Rub' al Khali
The Rub' al Khali or Empty Quarter is a desert in Saudi Arabia. It is one of the largest sand deserts in the world. It covers an area of about 650,000 square kilometres, more than all of Holland, Belgium and France together. Some of the sand dunes are more than 250 metres high.
- Peter Vincent (2008). Saudi Arabia: an environmental overview. Taylor & Francis. p. 141. . https://books.google.com/books?id=Vacv2wy3yd8C&lpg=PA141&dq=largest%20sand%20deserts%20Rub'%20al%20Khali&pg=PA141#v=onepage&q=largest%20sand%20deserts%20Rub'%20al%20Khali&f=false. Retrieved 8 April 2011.
- Clark, Arthur (May/June 1989). "Saudi Aramco World : Lakes of the Rub' al-Khali". saudiaramcoworld.com. http://www.saudiaramcoworld.com/issue/198903/lakes.of.the.rub.al-khali.htm. Retrieved April 10, 2011.