What large peninsula is linked to the mainland of Greece by Isthum corinth?

The large peninsula linked to the mainland of Greece by Isthmus Corinth is known as Peloponnese. It is the southernmost peninsula of the Balkan peninsula and is connected to the mainland by a narrow strip of land known as Isthmus of Corinth. The Isthmus of Corinth separates the Gulf of Corinth from the Saronic Gulf and has a canal running through it, allowing ships to pass from one side to the other without having to sail around the entire peninsula.