Geologické varhany, Natural monument in Měrotín, Czech Republic.

Geologické varhany is an exposed fossil cone karst in an abandoned limestone quarry at the crossroads of road II/635 between Litovel and Mladeč and the turnoff to Hradečná, in the Měrotín cadastral area. Devonian limestones form low convex cones separated by basin-, bowl- and trough-shaped hollows that pass into vertical cavities and fissures.

The cone-shaped karst in Devonian limestone formed under warm, humid tropical conditions during the Tertiary, not the Devonian. The site was later protected as a natural monument, but that protection was abolished in July 2025.

This site holds particular value for researchers studying fossil karst environments and ancient tropical landscapes. The formations offer insights into how the region developed over geological time.

The site lies in an abandoned limestone quarry at the crossroads of road II/635 between Litovel and Mladeč and the turn-off to Hradečná, in the Měrotín cadastral area. The area is small and has no facilities, so bring your own water; the exposed limestone is uneven underfoot.

The cone shapes genuinely resemble organ pipes, which inspired the site's name. This comparison between natural geology and human-made instruments makes the formations particularly memorable for visitors.