Map of the Gulf of Corinth with Rio-Antirio bridge
The Gulf of Corinth (Greek: Korinthiakόs Kόlpos) is a deep inlet of the Ionian Sea separating the Peloponnese from western mainland Greece. Shipping routes between the Greek commercial port of Piraeus to western Mediterranean through the Corinth Canal pass along this gulf. The dimensions of the Gulf are approximately 105 km long and 30 km wide with a basement depth of 3 km at its center. The modern 'Rio-Antirio' bridge (6 km) connects the Western Peloponnese with the Central Greece.
-- The Corinth Canal (Greek: Dhioryga tis Korinthou) is a artificial canal that connects the Gulf of Corinth with the Saronic Gulf in the Aegean Sea, separating the Peloponnese from the Greek mainland, arguably making the peninsula an island. Construction started in 1881, completed in 1893. An abortive effort was made to build it in the 1st century CE.