Tourists enjoy themselves at Qairhan Salt Lake in NW China's Qinghai

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A kid heaps salt up by the Qairhan Salt Lake in northwest China's Qinghai Province, Aug. 18, 2018. Abundant in mineral resources, Qairhan Salt Lake is a production base of potash fertilizer in China. (Xinhua/Tian Wenjie)

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Tourists enjoy themselves at the Qairhan Salt Lake in northwest China's Qinghai Province, Aug. 18, 2018. Abundant in mineral resources, Qairhan Salt Lake is a production base of potash fertilizer in China. (Xinhua/Tian Wenjie)

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A sunset afterglow is cast over the Qairhan Salt Lake in northwest China's Qinghai Province, Aug. 18, 2018. Abundant in mineral resources, Qairhan Salt Lake is a production base of potash fertilizer in China. (Xinhua/Tian Wenjie)

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Tourists enjoy themselves at the Qairhan Salt Lake in northwest China's Qinghai Province, Aug. 18, 2018. Abundant in mineral resources, Qairhan Salt Lake is a production base of potash fertilizer in China. (Xinhua/Tian Wenjie)

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A sunset afterglow is cast over the Qairhan Salt Lake in northwest China's Qinghai Province, Aug. 18, 2018. Abundant in mineral resources, Qairhan Salt Lake is a production base of potash fertilizer in China. (Xinhua/Zhang Long) 

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Two kids heap salt up by the Qairhan Salt Lake in northwest China's Qinghai Province, Aug. 18, 2018. Abundant in mineral resources, Qairhan Salt Lake is a production base of potash fertilizer in China. (Xinhua/Zhang Long)