Some rivers possess historical importance in the Medieval Islam. They include Nile, Tigris and Euphrates. The Tigris is about 1850 km long, rising in the Taurus Mountains of eastern Turkey. The Tigris unites with the Euphrates near Basra, and from this junction to the Persian Gulf the mass of moving water is known as the Shatt-al-Arab. Baghdad stands on the banks of the Tigris. Euphrates is historically one of the most important rivers in Southwest Asia.
The Nile is a major north-flowing river in Africa, generally regarded as the longest river in the world. The northern section of the river flows almost entirely through desert, from Sudan into Egypt, a country whose civilization has depended on the river since ancient times. The Nile ends in a large delta that empties into the Mediterranean Sea.