YUNCHENG, June 18, 2015 - Photo taken on June 17, 2015 shows a pink salt lake in Yuncheng, north China's Shanxi Province. Pink lake is a natural phenomenon due to the presence of alga that produces carotenoids, a type of halophile green micro-alga especially found in sea salt fields. Once the lake water reaches a salinity level greater than that of sea water, the temperature is high enough and adequate light conditions are provided, the alga begins to accumulate the red pigment beta carotene.(Xinhua/Zhan Yan)

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Visitors view a pink salt lake in Yuncheng, north China's Shanxi Province, June 17, 2015.

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