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Sysmä, Päijänne Tavastia, Finland |
The conditions for the creation of an ice wall on the lake occur about once a decade, when the ice is thick enough and there are large variations in the daily temperatures. As the ice melts, it creates a chasm, but when it freezes again and expands, it forces the edge of the chasm upwards, creating the 'wall' effect.
Observations From Members 
