Cuomujiri Lake (, , Tso Mo Kyi Ri Tso), is situated near Bayi Town, Nyingchi, Tibet Autonomous Region. This alpine glacial lake spans 10 km² at 3,400 meters elevation. Fed by meltwater from the Nyenchen Tanglha Range, it features turquoise waters framed by vertical vegetation zones: rhododendron thickets (3,200–3,600m), fir forests (3,600–4,200m), and permanent snowlines above 4,500m.
Geography.
Ecologically, it sustains endemic species like the Tibetan snowfinch and Himalayan musk deer, while serving as a critical stopover for migratory black-necked cranes (November–March). Local Monpa people revere it as "Guanyin’s Tear," hosting annual horse racing festivals during the Saga Dawa lunar month. Designated a National Water Conservancy Scenic Area in 2005, its access is regulated to preserve 1,500-year-old ice cores and sacred sites like Tangdi Village.