Which of the following is the longest tributary of the river Ganga?

Q. Which of the following is the longest tributary of the river Ganga?
Answer: Yamuna
Notes: The longest tributary of the river Ganga is the Yamuna river (1,380 kilometers). It is originated from Yamunotri glacier. The Ganga river joins the Yamuna at a distance of 770 kilometers from Hardwar near Allahabad.

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