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The USGS provides free downloads of Historical Topographic Maps (HTMC). If you would like, I can:
(maps) of ancient islands available for download. Ancient Islands Free Download
A 7,000-year-old megalithic structure (c. 5,000 BC) was discovered off the coast of Brittany, France, revealing a 120-meter-long, 3,300-ton wall that was submerged due to sea-level rises. The USGS provides free downloads of Historical Topographic
Historical Topographic Maps - Preserving the Past - USGS.gov 000-year-old megalithic structure (c. 5
to focus on a specific geographical region (e.g., Mediterranean, Pacific).
Research into Piraeus, Athens, demonstrates it was a distinct island during the late Neolithic period (4850–3450 BC) before becoming connected to the mainland via sea-level fluctuations. Resources for Further Study
