Visitors pose for photos in front of the Hukou Waterfall of the Yellow River in Yichuan County, northwest China's Shaanxi Province, Sept. 11, 2019. Hukou waterfall is located on the border area between north China's Shanxi and northwest China's Shaanxi provinces. Due to consecutive rainfall, the water volume of Hukou waterfall surged greatly in recent days. (Xinhua/Shao Rui)

Visitors view the Hukou Waterfall of the Yellow River in Yichuan County, northwest China's Shaanxi Province, Sept. 11, 2019. Hukou waterfall is located on the border area between north China's Shanxi and northwest China's Shaanxi provinces. Due to consecutive rainfall, the water volume of Hukou waterfall surged greatly in recent days. (Xinhua/Shao Rui)

Aerial photo taken on Sept. 11, 2019 shows a view of Hukou Waterfall of the Yellow River in Yichuan County, northwest China's Shaanxi Province. Hukou waterfall is located on the border area between north China's Shanxi and northwest China's Shaanxi provinces. Due to consecutive rainfall, the water volume of Hukou waterfall surged greatly in recent days. (Xinhua/Liu Shiping)

Visitors take photos of the Hukou Waterfall of the Yellow River in Yichuan County, northwest China's Shaanxi Province, Sept. 11, 2019. Hukou waterfall is located on the border area between north China's Shanxi and northwest China's Shaanxi provinces. Due to consecutive rainfall, the water volume of Hukou waterfall surged greatly in recent days. (Xinhua/Shao Rui)

Aerial photo taken on Sept. 11, 2019 shows a view of Hukou Waterfall of the Yellow River in Yichuan County, northwest China's Shaanxi Province. Hukou waterfall is located on the border area between north China's Shanxi and northwest China's Shaanxi provinces. Due to consecutive rainfall, the water volume of Hukou waterfall surged greatly in recent days. (Xinhua/Liu Shiping)

Visitors pose for photos in front of the Hukou Waterfall of the Yellow River in Yichuan County, northwest China's Shaanxi Province, Sept. 11, 2019. Hukou waterfall is located on the border area between north China's Shanxi and northwest China's Shaanxi provinces. Due to consecutive rainfall, the water volume of Hukou waterfall surged greatly in recent days. (Xinhua/Shao Rui)