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