The Indus and the Ganges are the two great Rivers which originate in the Himalayas/ Trans-Himalayas and all the Rivers of the Western and Central Himalayas drain into either of these two Rivers. The Indo - Gangetic Plain as the combined basin of these two Rivers is called sustains well over a Billion people and is one of the most thickly populated Regions on the Planet. The story of the Indus and the Ganga is the story of India in historical, social and religious contexts.