In the East of the Czech Republic, North of the town of Brno lies a protective nature reserve called the Moravian Karst. The reserve includes roughly 1,100 caves and gorges. Currently five of the cave sytems are open to the public to explore; these are Punkva Caves, Balcarka Cave, Kate?inská Cave, Výpustek Cave and Sloupsko-šoš?vské Caves.
This region is also home to one of the most important single geological features in the Czech Republic, the Macocha Abyss, a gorge 138 m deep, which was formed when the ceiling of an underground cave chamber collapsed. Macocha Abyss is also the place where the Punkva River begins to run underground through the Punkva cave system, and two small pools of water are visible at the surface.
In addition to caverns, the nature preserve also contains well-marked bicycle trails and hiking paths to explore.