Crystal ice floe forms on the Songhua River Sunday in Harbin, Northeast China’s Heilongjiang province. Photo: VCG

Ice accumulates on the Songhua River along the Harbin Grand Theatre on Monday. Ice floes appear twice a year on the river. Photo: VCG

A resident swims in the freezing river on Sunday in Harbin. Photo: VCG

A cold-water swimmer surnamed Liu, livestreams as he floats on the river on Sunday in Harbin. Photo: IC Photo

A member of a winter swimming team jumps into the freezing river on Sunday. Photo: VCG

A resident rows a boat through ice floes on the river on Saturday afternoon. Photo: VCG

A resident takes photos of the ice-clustered river on Sunday. Photo: VCG

Boats covered with snow berth on the freezing river on Saturday. Photo: VCG

Parts of the wetland along the Songhua River are seen frozen on Monday. Photo: VCG

A bridge is reflected on the frozen water in Harbin on Monday night. Photo: VCG