Suavjärvi

Suavjärvi (in Karelian, Russian: ) is a lake in the Republic of Karelia, Russia about 50 km north of the town of Medvezhyegorsk. The lake is approximately wide.

Mashchak and Naumov argue that Suavjärvi lies at the center of a deeply eroded and highly metamorphosed impact structure, the Suavjärvi structure, which has a diameter of . According to Mashchak and Naumov, this impact structure is characterized by gravity and magnetic lows and in its northeastern and southwestern parts, impact-generated polymict megabreccias. The megabreccias are composed of blocks of both basement granitoids and supracrustal greenstone. Shock metamorphic features in are reported to be rare and to consist of planar features, deformation bands, and mosaic structure in quartz and deformation feature in feldspars and biotite. Younger regional metamorphism has significantly altered the rocks composing the structure and may have either obliterated or altered any shock metamorphic effects.