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Panoramic View of Mount Gambier, South Australia.
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stairs and floating pontoon. -volcanic sinkhole -has a diameter of about 40 meters -height of about 8 meters above water level.
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Kilsby Sinkhole' is world-renowned as one of the best sinkhole dive sites due to its crystal clear water and breathtaking visibility ..
Page 6 (4m 18s)
Umpherston Sinkhole/ Balumbul. platforms at the top of the sinkhole.