Blue Stone, Pleshcheyevo Ozero National Park

Sin-Kamen is a type of pagan sacred stones, widespread in Russia in areas historically inhabited by both Eastern Slavic, and Volga Finnic tribes. Unlike Sledovik, Blue Stones did not have major hallows on them, and were venerated in a simpler way: by pouring water on them, or leaving food offerings. Some of the Blue Stones are still known, and to some extent venerated by local populations. ()