Cave a cave or cavern

See Also

Cave conservancy
Cave gate
Subterranean waterfall
Caving – Recreational pastime of exploring cave systems
Caving organizations
Cenote – natural pit or sinkhole that exposes groundwater underneath
List of caves– Wikipedia list article
Pit cave– Cave with significant vertical passages
Speleology – Science of cave and karst systems
Speleothem – A structure formed in a cave by the deposition of minerals from water
Subterranean river – A river that runs wholly or partly beneath the ground surface
Underground lake – Lake under the
Earth's surface