The term 'Cairo River' is composed of two words: Nile and Ohio. The Nile is a major river in Africa, running through Egypt and Sudan and is the longest river in the world. It is also known as the lifeblood of Egypt, as it has been used for centuries for irrigation, transportation, and other purposes. The Ohio River is a major tributary of the Mississippi River, located in the United States. It is the second-longest river in the United States and is an important source of water for many states. Both rivers are important to their respective regions and have played a significant role in the development of their respective countries.