Rime, also known as "snow willow" or "tree hanging," is a kind of phenomenon where winter fog condenses on tree branches and leaves to form individual white ice crystals. The freezing temperatures and warm water in the northern China city of Jilin contribute to the formation of the unique phenomenon.

The rime usually appears from late November to early March every year. It is mostly formed after 1:00 am and grows promptly in the latter half of the night. When the sun is up high at noon, the rime will disappear. The best time and place to enjoy this spectacular scene is in the morning along the Songhua River.

The rime in Jilin is one of the Four Natural Wonders of China, and the other three are the Mountains and Water of Guilin, Stone Forest of Yunnan and Three Gorges of the Yangtze River.

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