California Underground Online Exhibits An overview of the formation of caves, cave conservation, photography and wildlife together with local educational resources. Diagrams, pictures and slide shows.
Speleomania International discussion forums and links to cave-related news items and groups.
The Caving Pages An introduction to caving, cave types and conservation together with links to many caves and organisations around the world.
World Cave Database A list of long and deep caves from all around the world. Listed by depth, length and country.
U.S. Cavers Forum Discussion forums including caving, the NSS, the study of speleology, cave conservation & management, bats and gear.
The Virtual Cave A wide-ranging introduction to the geology of caves. Organised by geological feature with pictures and clickable virtual maps.
Caving From Spadout Articles on the terminology, techniques and gear used for caving. Discussion boards, editable information, feedback and links.
Cavechat.org Discussion forums including cave diving, news, conservation, equipment, photography, rescue and surveying. Hosted by the National Speleological Society.
