Lake Yanisyarvi

Lake in Republic of Karelia, Russia

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61°58′N 30°55′E / 61.967°N 30.917°E / 61.967; 30.917TypeImpact crater lakePrimary outflowsJänisjokiBasin countriesRussiaAverage depth11.6 m (38 ft)Max. depth57 m (187 ft)

Lake Yanisyarvi (Russian: Янисъярви; Finnish: Jänisjärvi) is a lake in the Republic of Karelia, Russia, located north of and draining to Lake Ladoga.

The basin of this somewhat circular lake was formed by meteorite impact 700±5 million years ago during the Cryogenian period. The crater is 14 kilometers (8.7 mi) in diameter.^[1]

Prior to World War II, the lake was thought to be the second known volcanic caldera in Finland (the other was Lake Lappajärvi). Both were eventually recognized as impact craters.