Kummakivi
Kummakivi is a large balancing rock in Ruokolahti, Finland. The 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.
The boulder is located in a forest in the western part of the Ruokolahti municipality, near the border of Puumala.