'Shipki La', a high altitude pass in the Himalayas, is located in :

Shipki La is a high-altitude mountain pass on the India-China (Tibet) border in Kinnaur district of Himachal Pradesh. The River Satluj (Sutlej), known as Langqen Zangbo in Tibet, enters India through this pass, making Shipki La the gateway of the Satluj Valley. The Chumbi Valley lies near Sikkim-Bhutan-Tibet trijunction (Nathu La/Jelep La), while Brahmaputra and Teesta valleys are in the Eastern Himalayas. Hence the correct answer is Satluj Valley.