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Tagsheptastadion
1 place carries this tag, across every kind and continent it appears in.
🇪🇬 Egypt · Submerged site
331 BCE – Medieval (331 BCE – 1422 CE harbour active) · Ptolemaic/Hellenistic / Roman / Byzantine
Alexandria's Portus Magnus — twin harbour, Heptastadion mole and 3500 fallen Pharos blocks 4–12 m down in Eastern Harbour.