Of the many tributaries and streams that join the Ganga, it is probably Yamuna that is the most significant. Not only is it extremely important to more than one religion, it also drains nearly 40% of the Ganga&rsquos basin &mdash Chambal, Betwa, Tons and Ken being some of Yamuna&rsquos own tributaries. Almost 57 million people depend on the Yamuna for survival, and some of India&rsquos most densely populated cities lie on the river&rsquos banks &mdash Delhi, Prayagraj, Agra and Mathura being a few of them.

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