Explanation:

Spiti river is a tributary of Sutlej river. The Spiti River nurtures the beautiful valleys of Lahaul-Spiti district of Himachal Pradesh. It originates from the Kunzum Range of the Himalayas in a way that it divides Lahaul and Spiti. Many Himalayan streams, including the Pin River, feed it. As this part of the Himalayas are desert areas with almost no rains, the river gets no rain water and all its water comes from the melted glaciers of the Himalayan ranges.