A cattle is seen in an unfrozen section of the Halha River in the city of Arxan of Hinggan League, North China's Inner Mongolia autonomous region, Nov 20, 2019. [Photo/Xinhua]

Despite Arxan's frigid winter cold, this geothermally-affected, 20-kilometer section of the Halha River never freezes even when the temperature drops to as low as minus 40 degrees Celsius.

It is amazing that it never freezes, even during the coldest time of winter.