postojna cave slovenian postojnska jama italian |
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| navigate by keyword : ancient archeology awe beautiful calcium cave cavern caving chambers cracks damp dark discovery espeloelogo europe exploring formation geologist geology grotte grotto hell inside interior jama karst landmark light limestone mineral mountain mystic natural nature paradise postojna postojnska rock slovenia slovenian speleology stalactite stalagmite stone tectonic tourism travel underground water |
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| Postojna Cave Slovenian: Postojnska jama; Italian: Grotte di Postumia is a 20,570 m long Karst cave system |
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