Peloponnese via the Isthmus of Corinth

The name is derived from the Peloponnesus mythological figure Pelops, the son of the legendary King Tantalus. The second part of the name is the Greek word for "island". Literally so, the name means "Island of Pelops".

In the Middle Ages instead of Peloponnesus there was the Italian name Morea (probably "mulberry") familiar with a term that referred to in the 10th century only to the western Peloponnese, but was extended to the peninsula from the beginning of the 13th century.

To reach the Peloponnesus from the mainland you need to pass the Isthmus of Corinth, which is about 6.3 km wide at it's greatest widths, broken by the Corinth Canal in 1893, nevertheless, the Peloponnesus is  not deemed as an Island because the canal is an artificial construction.