The term 'Lake Nasser Feeder' refers to the Nile River, which is the main source of water for Lake Nasser in Egypt. The Nile is a 4-letter word and is the longest river in the world, stretching over 4, 000 miles from its source in East Africa to its mouth in the Mediterranean Sea. It is an important source of irrigation and transportation for many countries in the region, and its waters are used to fill Lake Nasser, which is the largest artificial lake in the world.