National Geographic : 1984 Jan
NATIONALGEOGRAPHIC CARTOGRAPHICDIVISION LIKE A GREAT BOOT, the Piccaninnie Ponds stand out as we fly over the marshland protected since 1972 as Piccaninnie Ponds Conservation Park (above). Divers enter on the rough road seen at top left and swim from the dock. The Chasm drops where the pond narrows into the long heel. The Cathe dral lies at the base of the heel. Another shal low sinkhole forms the foot. Some 70 sinkholes, many of them dry, sur round Mount Gambier, a city of 20,000 people built around a volcanic crater lake.