Formed in 1982. Offers SRT training and joint expeditions with other groups. Includes lists of longest and deepest caves and contact information.

Formed in 1970. Involved in karst and lava tree-mold conservation, research work and publication of bulletins. Includes photos and contact information.

Began in 1960 and main explorations have been done in the limestone area of Akiyoshi-dai. Includes photos and contacts. [Japanese and English].

Formed in 1975 and consists of councils and special committees. Involved with karst conservation, underground safety and research. Includes contacts. [Japanese and English].

Meets monthly in Shinjuku. Includes membership requirements, meeting schedule, bulletin board, photos and contacts. [Japanese and English].