The Stob pyramids in the Rila mountain range, Bulgaria are naturally occurred rock formations that can be up to 12 meters hight and 40 meters thick in their base.
The principal factor for the formation of these pyramids is erosion due to rainfall.
Some of the formations are crowned by huge rocks on top of them.
The Stob Earth Pyramids in Rila, Bulgaria – Drone Photography

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Welcome on board, and congratulations for this great photo!