River Ganga is the most important river in India because:

It covers total distance of 1560 miles or 2520 kilometersUniversity of Roorkee’s D.S. Bhargava, an environmental engineer, studied and found that Ganga is the only river in the world that decomposes organic wastes at a rate 15 to 25 times faster compared to other rivers in entire worldD.S. Bhargava also found during his 3-year study that the river is capable of reducing its level biochemical oxygen demand way faster than any other river in this world.A British Physician during a return voyage to England took some water from Holy river, one of the dirtiest mouths of Ganga and observed that it remained fresh throughout the voyageBritish bacteriologist by the name Ernest Hanbury concluded that Ganga and its tributary Yamuna have been largely responsible for preventing the spread of CholeraThe Ganga delta formed by sediment-rich flows of rivers Ganga and Brahmaputra is the largest known river delta in world, spanning over an area of 59,000 square kilometers.Speaking of fertile plains, the plains of Ganga are extremely fertile, supporting the livelihood of over 400 million people. Another 1.2 billion Indians live in the 1557-mile stretch around this riveGanga in Hindu religion has been personified as goddess and it is a widespread believe that bathing in the river will give them forgiveness for their sins and will help them to attain salvation. Ganga has been considered a sacred river since the Vedic age. Though the first Veda – the Rig Veda scarcely mentioned Ganga and considered Saraswati and Indus as holiest of all rivers, the later three Vedas – the Yajur, Sam and Atharva Vedas heavily mention Ganga as a scared river.