The Ice Age that prevailed in Northern Europe some 11 000 years ago has significantly affected Finland's geography. The retreating ice sheet ploughed out an assortment of rocks, both big and small. One of the strangest is the Kummakivi boulder in Ruokolahti, Finland. This balancing giant lies on a convex bedrock surface with a very small footprint, but so firmly that it cannot be rocked with human force. Kummakivi ("the strange stone") has been protected since 1962. This boulder is on every tourist's must-see-list in South Karelia!