Mega Spilaio (Greek: Μέγα Σπήλαιο, lit. 'Great Cave'), formally the Monastery of the Dormition of the Theotokos (Ιερά Μονή Κοιμήσεως της Θεοτόκου), is a Greek Orthodox monastery in the municipality of Kalavryta, in the Peloponnese peninsula in southern Greece.
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