The islets of limestones in Mladeč Karst belong geologically to one of the belts of the Devonian rocks in the Central Moravian part of the Bohemian Massif (the Konice-Mladeč Devonian). These caves represent a predominantly horizontal and very broken labyrinth of corridors, domes and high chimneys with remarkable modelling of walls and ceilings, with stalactite and stalagmite decoration and with numerous block cave-ins, with some steep corridors which extend even below the level of the underground water. They are also famous for archaeological findings. The archaeologists claim that these caves have world meaning.