Lake Nasser, the dam's reservoir, 300 feet deep, 14 miles wide. Lake Nasser backs up the Nile about 320 km (200 miles) in Egypt and almost 160 km (100 miles) farther upstream (south) in Sudan.Of the Nile’s total annual discharge, some 74 billion cubic metres (2.6 trillion cubic feet) of water have been allocated by treaty between Egypt and Sudan, with about 55.5 billion cubic metres (1.96 trillion cubic feet) apportioned to Egypt and the remainder to Sudan.