- a desert basin in the Libyan Desert, in northwestern Egypt: lowest point is 435 feet (133 meters) below sea level. 6,950 square miles (18,000 square kilometers).
- an arid basin in the Sahara, in NW Egypt, impassable to vehicles. Area: about 18 000 sq km (7000 sq miles). Lowest point: 133 m (435 ft) below sea level
