Umpherston Sinkhole, also known, as The Sunken Garden was once a cave formed through dissolution of the limestone. The sinkhole was created when the top of the chamber collapsed downwards. Now the topsoil down on the floor forms the perfect environment for the sunken garden. Originally beautified by James Umpherston around 1886, the sinkhole is open at all times. As a bonuse at dusk each evening the area comes alive with possums as they venture into the floodlit gardens to feed. (Mount Gambier, South Australia)
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