There are traces of the ancient history of the planet on lake Janisjarvi. Cape Kintsiniemi is announced to be the monument of a federal value. It is formed of fossilated organic remnants of the most ancient algaes of the planet (their age is approximately 2 billion of years). There is no analogues to these fossils on the planet. Here, on the shores of Sovanjoki river, on the area of more than 50 hectares is a strata section of pink, dark grey, light grey and green rocks (dolomites, shales, sandstones); the thickness of their layers varies from 0.4 to 40 meters.