Icicles are seen at the Hukou Waterfall of the Yellow River in Jixian County, north China's Shanxi Province, Dec. 23, 2018. (Xinhua/Lyu Guiming)
Tourists take photos of icicles of the Hukou Waterfall of the Yellow River in Jixian County, north China's Shanxi Province, Dec. 23, 2018. (Xinhua/Lyu Guiming)
Icicles are seen at the Hukou Waterfall of the Yellow River in Jixian County, north China's Shanxi Province, Dec. 23, 2018. (Xinhua/Lyu Guiming)
Tourists take photos of icicles of the Hukou Waterfall of the Yellow River in Jixian County, north China's Shanxi Province, Dec. 23, 2018. (Xinhua/Lyu Guiming)
Icicles are seen at the Hukou Waterfall of the Yellow River in Jixian County, north China's Shanxi Province, Dec. 23, 2018. (Xinhua/Lyu Guiming)
Tourists take photos of icicles of the Hukou Waterfall of the Yellow River in Jixian County, north China's Shanxi Province, Dec. 23, 2018. (Xinhua/Lyu Guiming)