The Himalayan River is one of the most important river systems in the world. It is composed of two major rivers, the Ganges and the Indus, both of which are six and five letters respectively. The Ganges is the longest river in India and is considered to be a sacred river by Hindus. The Indus is the longest river in Pakistan and is the main source of water for the country. Both rivers have been used for centuries for irrigation, transportation, and other purposes.