Bangong Tso is Ladakhi Language and the Tibetan name is Tsomo Nganglha Ringpo, meaning long-necked swan. Bangong Tso is a lake in the most western of Tibet Plateau and is located about 12 kilometers northwest of Ritu County in Ali (Ngari) Prefecture.

It is located at border between Tibet and Kashmir. China and Indian dispute about the ownership of the lake. Now, China control about two third of the lake, and Indian about one third.

Bangong Tso is a tectonic lake. With long and narrow lake surface, Bangong Tso is about 155 kilometers from west to east, about 15 kilometers at the widest point, and  about 50 meters at the narrowest point from south to north, 604 square kilometers area. It is the longest lake in China. With 4241 meters above sea level, Bangong Tso is a inland lake and boasts 28,714 square kilometers drainage area. It consists of three long and narrow small lakes and connected by many channels. Besides, its the deepest point is about 57 meters.

The most special thing about the lake is different saltness from east to west, fresh water in the east, brackish water in the middle and salt water in the west.

There are more than a dozen islands with varying sizes in the lake. About more than 20 species birds live on these islands and the number of birds can reach to tens of thousands, mainly Anser Indicus, Chroicocephalus Brunnicephalus, Larus Ichthyaetus, Crested Duck, Tadorna Ferruginea and so on. Among of these bird species, Anser Indicus and Chroicocephalus Brunnicephalus have the largest number. When spring comes, the warm current from the Bay of Bengal blows into the Ali area. The flock of birds that flew from the plateau to South Asia in the winter of the last year to escape cold will fly back to lay their eggs and breed offspring. May to September every year is the best season for bird watching. Besides, it abounds in fish in the lake.