The Virtual Cave
- A wide-ranging introduction to the geology of caves. Organised by geological feature with pictures and clickable virtual maps.
- http://www.goodearthgraphics.com/virtcave/
Bill Storage - Speleology - Photographs and articles dealing with speleology and cave exploration. - http://www.bstorage.com/speleo/
Cavechat.org - NSS discussion forum for US cavers including sections for cave diving, news, conservation, equipment, photography, rescue and surveying. - http://forums.caves.org/
Caving From Spadout - Articles on the terminology, techniques and gear used for caving. Discussion boards, editable information, feedback and links. - http://www.spadout.com/wiki/index.php/Caving
U.S. Cavers Forum - Discussion forums including caving, the NSS, the study of speleology, cave conservation & management, bats and gear. - http://nssmembersforum.proboards28.com/
World Cave Database - A list of long and deep caves from all around the world. Listed by depth, length and country. - http://www-sop.inria.fr/agos-sophia/sis/DB/database.html
The Caving Pages - An introduction to caving, cave types and conservation together with links to many caves and organisations around the world. - http://www.cavesource.com
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. - http://www.museumca.org/caves/onli_realm.html