The "Empty Quarter," also known as the Rub' al Khali, is one of the largest sand deserts in the world, covering parts of Saudi Arabia, Oman, the United Arab Emirates, and Yemen. It spans approximately 1,000 kilometers (620 miles) in length and 500 kilometers (310 miles) in width, characterized by vast stretches of sand dunes, some reaching heights of up to 250 meters (820 feet). This desert is known for its extreme climate, with temperatures soaring above 50°C (122°F) in summer and very little rainfall throughout the year. Despite its harsh conditions, the Empty Quarter is home to unique wildlife and vegetation adapted to survive in such an arid environment.