The balls can range from a few inches to more than a feet across.
The pounding of the waves shape the ice into spheres.
A similar phenomenon is seen on Stroomi beach on the Gulf of Finland.
According to the German news portalSpiegel Online, a very specific condition is required for ice balls to form.
The sea must also be flat, and the base must not drop steeply.
These conditions prevail on the Gulf of Finland against Estonia.
Ice balls on Stroomi beach.
Photo credit:Aleksandr Abrosimov/Wikimedia
Ice balls in Lake Michigan.
Photo credit:Reddit
Ice balls in Lake Michigan.
