- a desert in Egypt between the Nile valley and the Red Sea. About 80,000 sq. mi.(207,000 sq. km).
- a vast wilderness, the world's fourth largest desert, occupying most of Arabia. About 900,000 sq. mi. (2,330,000 sq. km).
- a desert in E Egypt, between the Nile, the Gulf of Suez, and the Red Sea: mountainous parts rise over 1800 m (6000 ft). Area: about 220 000 sq km (85 000 sq miles)
- a desert, mainly in Saudi Arabia, forming the desert area of the Arabian Peninsula, esp in the north. Area: about 2 330 000 sq km (900 000 sq miles)
