The Stob Earth Pyramids (Bulgarian: Стобски пирамиди) are rock formations, known as hoodoos, situated at the foothills of the Rila mountain range in south-western Bulgaria.

The Stob Earth Pyramids are located at the western foothills of the Rila mountain range in the Balkan Peninsula at an altitude between 600 and 750 m. They occupy the Klisura ridge facing the valley of the Rilska River, a left tributary of the Struma.

[3] Geologically, the Stob Earth Pyramids are part of the Blagoevgrad Graben that consists of lakebed, alluvial and sloping deposits dated from the Pliocene and Pleistocene epochs.

[2] The Pleistocene stratum above is reddish with alternating layers of cobble conglomerate and lightly soldered sandstone, as well as larger rock pieces originating from the slopes of Rila.

Their height averages some 6 to 10 m but can reach up to 12 m; the thickness at the base is up to 40 m.[1][2][4] Most of them are facing in southern direction but there are also a few grouped together on the northern slopes of the ridge overlooking Stob.