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

Janisjarvi crater lake 01.jpg
LocationRepublic of Karelia
Coordinates61°58′N 30°55′E / 61.967°N 30.917°E / 61.967; 30.917Coordinates: 61°58′N 30°55′E / 61.967°N 30.917°E / 61.967; 30.917
TypeImpact crater lake
Basin countriesRussia

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.


  1. ^ "Jänisjärvi". Earth Impact Database. Planetary and Space Science Centre University of New Brunswick Fredericton. Retrieved 2009-08-19.

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