Tourists enjoy themselves on the frozen Songhua River in Harbin, capital of northeast China's Heilongjiang Province, Jan. 20, 2019. (Photos: Xinhua)

Tourists play banana boats on the frozen Songhua River in Harbin, capital of northeast China's Heilongjiang Province, Jan. 20, 2019.

Tourists have fun on a skating rink in Harbin, capital of northeast China's Heilongjiang Province, Jan. 20, 2019.

Tourists play on the frozen Songhua River in Harbin, capital of northeast China's Heilongjiang Province, Jan. 20, 2019.

Tourists play bumper cars on the frozen Songhua River in Harbin, capital of northeast China's Heilongjiang Province, Jan. 20, 2019.

A tourist plays with an ice slide in Harbin, capital of northeast China's Heilongjiang Province, Jan. 20, 2019.

Tourists play bumper cars on the frozen Songhua River in Harbin, capital of northeast China's Heilongjiang Province, Jan. 20, 2019.

Tourists play banana boats on the frozen Songhua River in Harbin, capital of northeast China's Heilongjiang Province, Jan. 20, 2019.