Nubian Sandstone Aquifer System

The Nubian Sandstone Aquifer System is said to be the world's largest known fossil water aquifer system.^[1] It is underground the Eastern end of the Sahara Desert. It spans the boundaries of four countries in north-eastern Africa north-western Sudan, north-eastern Chad, south-eastern Libya, and most of Egypt.^[2]

The Great Man-made River Project (GMMR) in Libya makes use of the system. It takes water from this aquifer, about 2.4 km³ of fresh water for drinking and agriculture each year. This system is mainly used to supply water to the Kufra oasis.^[3]