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Poloniny National Park LTSER - Slovakia |
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Porton Down - United Kingdom |
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Postojna-Planina Cave System - Slovenia |
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Retezat Biosphere Reserve - Romania |
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Réunion National Park - France |
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Rhine-Main-Observatory - Germany |
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River Bure - United Kingdom |
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River Bush - United Kingdom |
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River Coln - United Kingdom |
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River Coquet - United Kingdom |