English: The Great Man-Made River (GMR, النهر الصناعي العظيم) is a network of pipes that supplies water from the Sahara Desert in Libya, from the Nubian Sandstone Aquifer System fossil aquifer. It is the world's largest irrigation project. It is the largest underground network of pipes (2820 km) and aqueducts in the world. It consists of more than 1,300 wells, most more than 500 m deep, and supplies 6,500,000 m3 of fresh water per day to the cities of Tripoli, Benghazi, Sirte and elsewhere. The Libyan leader Muammar Gaddafi described it as the "Eighth Wonder of the World.