Some places that appear on maps today were once completely surrounded by water. Over time, nature and human engineering changed their geography forever.
1. Mont Saint-Michel, France
Mont Saint-Michel was once a true tidal island, separated from mainland France by the sea.
A causeway later connected it permanently to the mainland, changing the way visitors reached the famous medieval monastery. Recent restoration projects have worked to restore the natural tidal flow around the island.
2. Coney Island, United States
Coney Island was once separated from Brooklyn by tidal channels.
Over time, landfilling and urban development connected it more closely to the rest of New York City, transforming it from an isolated coastal area into a famous entertainment destination.
3. Marblehead Peninsula, United States
Located in Ohio along Lake Erie, Marblehead Peninsula was historically separated from the mainland by waterways.
Changes in land use and transportation connections eventually altered the landscape, making it function as part of the mainland rather than a distinct island.
4. Lindisfarne, England
Holy Island in Northumberland remains technically an island, but its connection changes with the tides.
A tidal causeway allows vehicles to cross during low tide, creating a place that is sometimes connected to the mainland and sometimes surrounded by water.
5. Venice, Italy
Venice is still an island city, but centuries of bridges, roads, and land connections have dramatically changed how people access it.
The construction of the railway bridge in the 1800s and later road connections transformed a once-isolated lagoon settlement.
6. Tyre, Lebanon
The ancient city of Tyre was originally built on an offshore island.
In the 4th century BC, Alexander the Great constructed a massive causeway during his siege of the city. Over centuries, sediment built up, permanently connecting the island to the mainland.