Tourists stroll in cole flower fields along the Qinghai Lake during the Mid-Autumn Festival holiday in northwest China's Qinghai Province, Sept. 14, 2019. (Xinhua/Zhang Long)

A tourist poses for a photo along the Qinghai Lake during the Mid-Autumn Festival holiday in northwest China's Qinghai Province, Sept. 14, 2019. (Xinhua/Zhang Long)

A child poses for a photo along the Qinghai Lake during the Mid-Autumn Festival holiday in northwest China's Qinghai Province, Sept. 14, 2019. (Xinhua/Zhang Long)

A tourist rides a horse along the Qinghai Lake during the Mid-Autumn Festival holiday in northwest China's Qinghai Province, Sept. 14, 2019. (Xinhua/Zhang Long)

Tourists stroll along the Qinghai Lake during the Mid-Autumn Festival holiday in northwest China's Qinghai Province, Sept. 14, 2019. (Xinhua/Zhang Long)