Which peninsula is separated from mainland Greece by the Corinth Canal?

The Peloponnese is separated from mainland Greece by the Corinth Canal.

The Peloponnese is a large peninsula forming the southern part of Greece. It was connected to mainland Greece by the narrow Isthmus of Corinth until the Corinth Canal was completed in 1893. The canal cuts through the isthmus and links the Gulf of Corinth with the Saronic Gulf.

Although often called an island after the canal's construction, the Peloponnese remains geographically a peninsula because a bridge connection across the canal keeps it attached to the mainland. The region includes historic places such as Olympia, Epidaurus, Mycenae and Sparta.

Its name comes from Pelops, a figure in Greek mythology, and the Greek word nesos, meaning “island.” The Peloponnese therefore has a name suggesting an island even though its geographic classification is a peninsula.