Kummakivi is a large balancing rock in Ruokolahti, Finland. The length of Kummakivi is about 23 feet (or 7 meters). It is supported by the minute, precipitously sloping imprint of a smaller rock outcrop that rises from the ground of the forest. The rock in question looks to be on the verge of falling off its ledge, yet it is impossible to move it, at least not with the strength of human muscles.