Underground Sea

The Moravian Karst (Czech: Moravský kras) is a karst landscape and protected nature reserve to the north of Brno in the eastern part of the Czech Republic, located near the town of Blansko. 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 Punkvení cave system, and two small pools of water are visible at the surface.