A tourist admires the frozen waterfall at Da'anshan Mountain scenic spot in Shahe, north China's Hebei Province, Jan. 20, 2019. (Photos: Xinhua)

A tourist takes selfies in front of the frozen waterfall at Da'anshan Mountain scenic spot in Shahe, north China's Hebei Province, Jan. 20, 2019.

Photo taken on Jan. 20, 2019 shows s frozen waterfall at Da'anshan Mountain scenic spot in Shahe, north China's Hebei Province.

Photo taken on Jan. 20, 2019 shows a frozen waterfall at Da'anshan Mountain scenic spot in Shahe, north China's Hebei Province.

Aerial photo taken on Jan. 20, 2019 shows a frozen waterfall at Da'anshan Mountain scenic spot in Shahe, north China's Hebei Province.