Hiidenkirnu, Kullaanvuori, Rusko | Giant's kettle, Rusko, Finland
Giant's kettle at Warsaw Caves
A giant's kettle, also known as either a giant's cauldron, moulin pothole, or glacial pothole, is a typically large and cylindrical pothole drilled in solid rock underlying a glacier either by water descending down a deep moulin or by gravel rotating in the bed of subglacial meltwater stream.
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