UIS Commission on Karst Hydrogeology and Speleogenesis
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Glossary of Karst and Cave Terms

anthropocentric definitions
Definitions of caves or parts of caves that include accessibility by human explorers as one of their limiting conditions. Most well known among these is the definition published by the International Speleological Union, that 'A cave is a natural underground opening in rock that is large enough for human entry' (see proto-caves) [9].