Which of the following river is NOT the tributary of Ganga?

Correct option is C

The correct answer is (C) Mahadayi

Explanation:
• The Mahadayi river (also known as the Mandovi in Goa) is a west-flowing river that originates in the Western Ghats of Karnataka.
• It does not belong to the Ganga river system; instead, it flows into the Arabian Sea.
• It is the lifeline of the state of Goa and is currently a subject of water-sharing disputes between Karnataka, Goa, and Maharashtra.

Information Booster:
• Ganga Tributaries: The Ganga has several major tributaries divided into Left Bank (Ramganga, Gomti, Ghaghara, Gandak, Kosi, Mahananda) and Right Bank (Yamuna, Son, Punpun).
• Kosi: Known as the 'Sorrow of Bihar' due to its frequent course changes and flooding.
• Gandak: Joins the Ganga at Sonpur near Patna.

Additional Knowledge:
• Ghaghara (Option A): A major left-bank tributary that originates in the Tibetan plateau and joins the Ganga near Chhapra.
• Kosi (Option B): An antecedent river that originates in the Himalayas (Nepal/Tibet) and joins the Ganga in Bihar.
• Gandak (Option D): Formed by the union of the Kali and Trisuli rivers in Nepal, it is a significant Himalayan tributary of the Ganga.