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How is the Peloponnese connected to mainland Greece?

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The Peloponnese is connected to mainland Greece by the Isthmus of Corinth, a narrow neck of land that separates the Saronic Gulf from the Gulf of Corinth.12

While historically a peninsula joined to the mainland, the region is now technically considered an island because the Corinth Canal—a 3.9-mile (6.3-km) waterway opened in 1893—cuts across this isthmus.13