Rub' al Khali is the world’s largest continuous sand desert, located mainly in the Arabian Peninsula.
Its Arabic name means “Empty Quarter,” reflecting the region’s sparse settlement and difficult conditions. The desert covers about 650,000 square kilometres, with most of it in Saudi Arabia and smaller sections in Oman, the United Arab Emirates, and Yemen.
The landscape includes enormous dunes, gravel plains, salt flats, and interdune areas. Some dunes rise hundreds of metres, and the desert’s sands vary from pale gold to reddish brown because of mineral content and weathering.
Although it appears almost empty, the Rub' al Khali supports specialised life, including Arabian oryx in protected areas, reptiles, insects, and drought-tolerant plants. Ancient lake and river deposits show that parts of the peninsula experienced wetter climates in the past, when humans and animals could move across landscapes now dominated by sand.