Tourists visit the Hukou Waterfall scenic spot in the border area between north China's Shanxi and northwest China's Shaanxi provinces, Aug. 26, 2020. (Xinhua/Ma Yimin)

Tourists watch a performance at the Hukou Waterfall scenic spot in the border area between north China's Shanxi and northwest China's Shaanxi provinces, Aug. 26, 2020. (Xinhua/Ma Yimin)

A tourist poses for photo at the Hukou Waterfall scenic spot in the border area between north China's Shanxi and northwest China's Shaanxi provinces, Aug. 26, 2020. (Xinhua/Ma Yimin)

Tourists visit the Hukou Waterfall scenic spot in the border area between north China's Shanxi and northwest China's Shaanxi provinces, Aug. 26, 2020. (Xinhua/Ma Yimin)

Tourists visit the Hukou Waterfall scenic spot in the border area between north China's Shanxi and northwest China's Shaanxi provinces, Aug. 26, 2020. (Xinhua/Ma Yimin)

Tourists visit the Hukou Waterfall scenic spot in the border area between north China's Shanxi and northwest China's Shaanxi provinces, Aug. 26, 2020. (Xinhua/Ma Yimin)