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Where does the Sutlej River rise before flowing through Himachal Pradesh?

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Steep, green slopes with dense trees rise on both sides of a narrow valley in Kullu Valley, Himachal Pradesh, India, with mist and clouds partially obscuring the peaks. — Himachal Pradesh The valley of the gods, Kullu Valley, central Himachal Pradesh, India.

The Sutlej River rises on the north slope of the Himalayas in Lake La’nga, located in southwestern Tibet. Before entering the Indian state of Himachal Pradesh, the river flows northwestward and then west-southwestward through Himalayan gorges.1