The Enigmas on Earth

Impact Craters on Earth
Work in Progress

Photo submitted by Herbert Csadek, Astronomical Association Vienna (WAA); Kuffner Observatory, Vienna
Karikkoselkä is a 1.5 km diameter impact structure that is only 1.88 Ma years old.

See Also - (Both are also lakes)
Lappajärvi, Finland 
Sääksjärvi, Finland 

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