Chaka Salt Lake, Salt lake in Ulan County, Qinghai Province, China.

Chaka Salt Lake is an oval salt lake near the eastern end of the Qaidam Basin in Ulan County, Qinghai, 298 kilometres west of Xining. Its surface lies at 3,059 metres, and a thick sodium-salt layer sits close to the shallow, largely dried water, giving the flat bed its reflective sheen. A branch line links the town of Chaka to the Qinghai–Tibet railway.

Salt extraction at this location dates back to the Western Han Dynasty between 206 BC and 25 AD, when Qiang people harvested salt here, later becoming an officially managed resource during Ming and Qing periods.

Known as China's Sky Mirror, the lake holds names in Tibetan and Mongolian languages, representing the cultural diversity of the Haixi Mongol and Tibetan Autonomous Prefecture where it is located.

The site operates year-round from 7:30 AM to 7:10 PM with ticket prices of 60 yuan during peak season and 30 yuan in low season, accessible via transportation from Xining and local bus services.

The tourist area and the salt-production zone are managed separately: a dividing strip keeps visitors out of the closed production area, where salt is still harvested to ISO 9001 quality standards. The narrow-gauge line that once carried salt now runs tourist trains.