Crete’s extensive limestone formations, rugged karst landscape and the continuous action of water have created thousands of caves, sinkholes and deep vertical cave systems. The island’s underground world is of exceptional geological, hydrological and biological importance, making Crete one of the most significant destinations for speleological exploration in Greece.

Caving is not simply a visit to a cave, but an activity combining exploration, surveying and scientific research. Speleologists study the formation and morphology of caves, underground watercourses, mineral formations and the organisms that have adapted to life in complete darkness. Many Cretan caves also possess considerable archaeological, historical and religious significance.

The island’s most important caving areas include the White Mountains, the Psiloritis UNESCO Global Geopark, the Sitia UNESCO Global Geopark and Mount Stroumboulas. The Sitia Geopark alone contains one of the island’s richest karst landscapes, with more than 170 documented caves.

The two deepest known caves in Greece are located in the White Mountains. Gourgouthakas reaches a depth of 1,208 metres, while the Liodari or Lion Cave reaches 1,110 metres. Both are highly demanding underground systems with vertical shafts, underground pools and sumps, and can only be explored by properly trained and equipped caving teams.

Several caving and mountaineering clubs operate on Crete, contributing to the exploration, surveying and conservation of caves, as well as the training of new cavers. Visitors should never enter an undeveloped cave alone, even when its entrance appears easily accessible. Exploration requires specialist training, a helmet, reliable backup lighting, appropriate equipment and a team familiar with cave-rescue procedures.

Caves are extremely sensitive ecosystems. Visitors must never break or touch mineral formations, leave rubbish or disturb bats, especially during breeding and hibernation periods. Archaeological finds, bones and other objects must remain in their original position and should be reported to the appropriate authorities.