Porto Koufo (Πόρτο Κουφό ) is the largest natural harbour in Greece (in depth). The harbour was mentioned by the historian Thucydides.
Porto Koufo, Photo: Klearchos Kapoutsis
German submarines used it during World War II because of its geographical location and direct access to the Aegean Sea.
Porto Koufo is located in the Greek prefecture of Chalkidiki.
Medieval Greece / Byzantine Empire
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