"Experts say it is caused by a rare process in which small pieces of ice are rolled over by wind and water. The balls of ice covered an area of about 30m (100ft). The smallest were the size of eggs and the biggest were the size of footballs.BBC Weather expert George Goodfellow said conditions needed to be cold and a bit windy for the ice balls to form."The general picture is that they form from pieces of the larger ice sheet which then get jostled around by waves, making them rounder," he said.
"They can grow when seawater freezes on to their surfaces and this also helps to make them smoother. So the result is a ball of smooth ice which can then get deposited on to a beach, either blown there or getting left there when the tide goes out.
"Similar sights have been reported before, including in Russia and on Lake Michigan near Chicago.
https://www.bbc.com/news/world-europe-50338447
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