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

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)

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)

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)

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)

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)

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)