Gedhe Biru Bolongan buta prau silem sinkhole. Bolongan layang ideran ing wangun, liwat 300 meter (984 ft.) tengen lan 125 meter (410 ft.) jero. Paling gedhé ing donya alam tatanan saka sawijining jinis.
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Gedhe Biru Bolongan : Donya kang paling gedhé prau silem sinkhole.
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