The African Waterway term is composed of two crossword solutions, the Nile and WADI. The Nile is the longest river in the world, stretching over 4, 000 miles from East Africa to the Mediterranean Sea. It is a major source of water for Egypt and Sudan and is an important part of their culture and history. The WADI is a dry riverbed in North Africa that is usually filled with water during the rainy season. It is an important source of water for many countries in the region, including Morocco, Algeria, and Tunisia.