Kummakivi
Ruokolahti, Finland
Nature
Kummakivi is a large balancing rock in Ruokolahti, Finland. The 7-metre-long boulder is a glacial erratic that lies on a convex bedrock surface with such a small footprint that it almost appears to be moving, but so firmly that it cannot be rocked with human force.
From Wikipedia, CC BY-SA 4.0
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