Chagan Lake, the largest natural lake in Jilin Province, sees its first freeze-up of this year on December 15, 2018. Local fishermen are expected to start their winter fishing as the thickness of ice covering the lake reaches over 40 centimeters. (Photos: IC)

Frozen Chagan Lake in Jilin Province is seen from this aerial view on Saturday December 15, 2018. The local temperature plummeted to -20 degree Celsius at night, causing the 500-square-meter lake to completely freeze up.

Frozen Chagan Lake in Jilin Province is seen from this aerial view on Saturday December 15, 2018. The local temperature plummeted to -20 degree Celsius at night, causing the 500-square-meter lake to completely freeze up.