The caves of the National Park are the result of the geomorphology and the erosion produced by the water.
The geopark has more than 1400 caves, for the most part chasms with steep, vertical descents. Very few are accessible. Worth noting is the Drakolaki cave, that has an underground river with rich stalagmite and stalactite formations, and the Kormokopos cave with an impressive entrance and a big hallway.
Famous are the two deepest caves of Greece: Gourgouthakas is 1208m deep and was discovered by French speleologists in the 90s. The Liodari cave is 1110m deep and was discovered by French and Greek speleologists in 2008. Access to both is only possible with special equipment. The same goes for the Tzanis cave.
