It was formed by a group of southeastern cavers in 1991 and currently has about 500 members.
Membership is open to all persons interested in caves and cave conservation.
The MAR site has links to other grottos, state caving laws, caving access lists, MAR publications and information on the MAR Spring and Fall gatherings. The Virginia Region - The VAR is regional organization of Virginia area grottos. The VAR site has links to other grottos, state caving laws and information on the VAR Spring and Fall gatherings.