|Max. length||13.8 km (9 mi)|
|Max. width||8.6 km (5 mi)|
|Surface area||87.7 km2 (0 sq mi)|
|Surface elevation||4,396 m (14,423 ft)|
Tong Tso (Tibetan: སྟོང་མཚོ, Wylie: stong mtsho) or Dong Co (Chinese: 洞错; pinyin: Dòng Cuò）is a plateau lake in Gêrzê County, Tibet Autonomous Region, southwest of China. The name of lake means "Desolate Lake" in Standard Tibetan. The lake has a total area of about 87.7 square kilometers. Lying at an elevation of 4,396 metres, it is dotted with two islands.