Οι Τρυποσπηλιές βρίσκονται σε μια κατάφυτη περιοχή στον Κάλαμο, νοτιοανατολικά του Οτζιά. Είναι σπηλαιώδεις εσοχές που χρησίμευαν ως γαλαρίες από τις οποίες γινόταν εξόρυξη μίλτου, ενός σιδηρούχου ορυκτού παρεμφερούς με τον αιματίτη.
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