Q. Which is the longest tributary of the river Indus ?

Explanation by: Akash Lawaniya

The Sutlej River is the largest tributary of the Indus river. It is the longest of the five major rivers that flow through the region of Punjab in northern India and Pakistan. It is the easternmost and the longest tributary of the Indus River. The source of the river is at Lake Rakshastal near Mount Kailash., in Tibet.