Originating from the icy grip of the Angsi Glacier, near the northern slopes of the Himalayas, close to Lake Manasarovar in western Tibet, the Yarlung Tsangpo—known as Siang in Arunachal Pradesh and the Brahmaputra in Assam—embarks on a long and winding 2,900 km journey. It flows eastward across the Tibetan Plateau, a seemingly calm giant, until it reaches the easternmost edge of the Himalayas. And then, it encounters an obstacle—a towering 7,782-metre peak called the Namcha Barwa. But the river does not stop. In one of nature’s most breathtaking feats, it takes a dramatic U-turn around the mountain—the Great Bend, one of the sharpest and most spectacular river bends on Earth.