Banggong Co Lake, which means "the long, narrow enchanting lake," is located on the route from Shiquanhe to Doima Township. It is also known as the "swan lake" of the border between China and Indian Kashmir. At an altitude of 13,914 feet, with a total length of more than 93 miles from west to east, the lake is narrower from south to north, with the narrowest point being 131 feet. The lake has an approximate area of 233 square miles. Its deepest point is 136 feet. The eastern part of the lake belongs to China, while the western part belongs to Indian Kashmir. Ice covers the lake for six months every year.

Bird Islet where thousands of gulls live, is located in the lake. The islet is small, about 984 feet long and 656 feet wide. Red willows cluster along the lake bank, creating a beau­tiful view. Gulls and their eggs can be seen everywhere—between rocks, in the grass, on the lake, and on the bank. There are also a small number of other birds and fowl, such as gray ducks that live on fish in the lake. When spring comes and warm air from the Bay of Bengal blows into the Ngari Plateau, groups of birds that have migrated from the cold plateau to the warmth of southern Asia the previous winter fly back to the islet. The months of May through September are the best season for observing birds. Herdsmen living on the lakefront often tell the story of dragons and monsters in the lake, which adds to its mysterious color.