This perfectly round lake is located in the Ryazan region (enter N54° 37′40.11″ E41° 5′57.84″ on google maps). Its main feature, besides its shape, is the crystal clear water and the absence of any algae.

Officially, the lake is of meteorite origin and clearly older than 500… pic.twitter.com/2Ct7SJUu2N

— @AndTartary and antiquity (@andtartary2) May 25, 2023