The famous Corinth Canal, which separates Peloponnese from mainland Greece, connects the Gulf of Corinth with the Saronic Gulf.The strip of land that connects the Peloponnese and mainland Greece , the Isthmus, is really worth visiting .The oppressor of Corinth, Periander, was the first who envisioned the Corinth Canal in 602BC, but the technical abilities in ancient times made  this difficult  to carry out.