Chaka Salt Lake (; ) is a salt lake in Ulan County, Haixi Prefecture, Qinghai, China. The oval lake is located near the eastern end of Qaidam Basin, to the west of the provincial capital Xining. The name "Chaka" (ཚྭ་ཁ) means "salt lake" in Tibetan.
A branch railway connects the town of Chaka to the Qinghai–Tibet railway. Originally constructed for transporting salt, the line is nowadays used by tourist trains from Xining, with a travel time of over 4 hours.
Chaka Lake is a major tourist destination and a key salt mine in Qinghai. In 2018, it received more than 3 million visitors. The lake is famous for its crystal-blue water and reflective lake bed, and is popularly known as "Mirror of the Sky".
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