Answer: Yamuna
Notes: A recent survey of the Hindon River has revealed alarming water quality concerns, with preliminary tests showing zero dissolved oxygen (DO) at multiple locations, making the river “uninhabitable” for most aquatic life. The Hindon River is a tributary of the Yamuna River, flowing through parts of Uttar Pradesh and Haryana. It originates in the Saharanpur district of Uttar Pradesh, in the Siwalik Hills, at an elevation of approximately 800 meters (2,625 feet) above sea level. The river flows across the industrial belt of Western Uttar Pradesh and Haryana before merging with the Yamuna near Noida, covering a total length of 400 km. Its main tributaries include the Kali (West) River and the Krishni River.
