Lake, southern Egypt and northern Sudan. About 300 mi (480 km) long, it was formed in the 1960s by the construction of the Aswan High Dam in order to control the annual floods of the Nile River, whose waters now feed the lake. Its waters, when discharged downstream, have brought some 1,250 sq mi (3,240 sq km) of additional land under irrigation. Its formation flooded a number of archaeological sites, including those found at Abu Simbel. In The Sudan it is known as Lake Nubia.