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The Kanozero Petroglyphs are a set of rock drawings discovered in 1997 on an island in Lake Kanozero in the southwestern part of the Kola Peninsula in Murmansk Oblast, Russia. The petroglyphs has been dated to the 2nd and 3rd millennium BC. There are about 850 different drawings at the site. Their meaning is not yet deciphered.
References
Kanozero Petroglyphs Wikipedia(Text) CC BY-SA