Mirror of the Sky, Chaka Salt Lake.

Chaka Salt Lake, the "Mirror of the Sky", is located in Ulan County, Haixi Mongol and Tibetan Autonomous Prefecture, Qinghai Province. It is a brine lake with both solid and liquid states, covering an area of about 105 square kilometers. "Chaka" means "salt pool" in Tibetan. From June to October each year, due to the crystallization of a large amount of lake salt deposits, the bottom of the lake forms a salt field several tens of meters thick. People can walk into the lake and stand on the salt field, forming a clear reflection. This is where the name "Mirror of the Sky" comes from.