Answer: Aravalli Range
Notes: On 1 August 2025, the Union Government informed Lok Sabha that 13 river stretches in Gujarat are officially classified as polluted. Sabarmati River, especially the stretch between Raysan to Vautha, is the worst affected with a Biochemical Oxygen Demand (BOD) level of 292 mg/litre. Sabarmati River is a monsoon-fed, west-flowing river. It originates from the Aravalli Mountain Range in Udaipur district, Rajasthan. The river is called Wakal in its early course and flows southwest through Rajasthan and Gujarat. It empties into the Gulf of Khambhat in the Arabian Sea.
