Pink salt lake attracts visitors in China's Yuncheng (5)

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