The term Bosnian pyramids has been used for a cluster of natural geological formations sometimes known as flatirons

Flatiron (geomorphology)

A flatiron in geomorphology is a steeply sloping wedge-shaped landscape feature created by differential erosion of a resistant rock layer which is inclined in the same direction as, but at a steeper angle than the exposed mountain slope. Flatirons are associated with hogback ridges...

 near the Bosnian

Bosnia and Herzegovina

Bosnia and Herzegovina , sometimes called Bosnia-Herzegovina or simply Bosnia, is a country in Southern Europe, on the Balkan Peninsula. Bordered by Croatia to the north, west and south, Serbia to the east, and Montenegro to the southeast, Bosnia and Herzegovina is almost landlocked, except for the...

 town of Visoko, northwest of Sarajevo

Sarajevo

Sarajevo |Bosnia]], surrounded by the Dinaric Alps and situated along the Miljacka River in the heart of Southeastern Europe and the Balkans....

. The hill named Visočica

Visocica

Visočica Visočica Visočica (also known as Brdo Grad (Bosnian: Hill Town) is a hill in Bosnia and Herzegovina famous as the site of the Old town of Visoki as well the recent claim that it is one of the Bosnian pyramids....

 became the focus of international attention in October 2005 following a news-media campaign promoting the idea that they are human-made and the largest ancient pyramid

Pyramid

A pyramid is a structure whose outer surfaces are triangular and converge at a single point. The base of a pyramid can be trilateral, quadrilateral, or any polygon shape, meaning that a pyramid has at least three triangular surfaces...

s on Earth.

Scientific investigations of the site show that the so-called pyramids are natural formations and that there are no signs of human building involved.