A train runs near a sculpture at the scenic area of the Chaka Salt Lake in Wulan County, northwest China's Qinghai Province, July 26, 2014. (Xinhua/Wang Song)

Tourists visit the Chaka Salt Lake in Wulan County, northwest China's Qinghai Province, July 26, 2014. (Xinhua/Wang Song)

Tourists visit the Chaka Salt Lake in Wulan County, northwest China's Qinghai Province, July 26, 2014. (Xinhua/Wang Song)

Tourists visit the Chaka Salt Lake in Wulan County, northwest China's Qinghai Province, July 26, 2014. (Xinhua/Wang Song)

Tourists walk past a sculpture made of salt at the scenic area of the Chaka Salt Lake in Wulan County, northwest China's Qinghai Province, July 26, 2014. (Xinhua/Wang Song)

Tourists pose for photos at the scenic area of the Chaka Salt Lake in Wulan County, northwest China's Qinghai Province, July 26, 2014. (Xinhua/Wang Song)

Tourists visit the Chaka Salt Lake in Wulan County, northwest China's Qinghai Province, July 26, 2014. (Xinhua/Wang Song)