The Qinghai Lake, or Ch'inghai Lake, is the largest lake in China. It is in the Qinghai Province, which is where the lake gets its name. The lake has a surface area of 4,186 square kilometres (1,616 sq mi). The lake is a alkaline salt lake. Its size has changed over time. During the 20th century, it became smaller, but has been getting larger since 2004. The average depth of the lake was 21 metres (69 ft) in 2008. The deepest part of the lake was 25.5 metres (84 ft).[2][3]
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