Isthmus of Corinth
The Isthmus of Corinth is the narrow land bridge which connects the Peloponnese peninsula with the rest of the mainland of Greece, near the city of Corinth. The word "isthmus" comes from the Ancient Greek word for "neck" and refers to the narrowness of the land. The Isthmus was known in the ancient world as the landmark separating Peloponnese from mainland of Greece. Theseus, on his way to Athens erected a pillar on the Isthmus of Corinth, which bears two inscriptions. One towards the East, i.e. towards Attica reading: "Here is not Peloponnesus, but Ionia" (τάδ᾽ οὐχὶ Πελοπόννησος, ἀλλ᾽ Ἰωνία) and the one towards the West, i.e. towards the Peloponnese: "Here is Peloponnesus, not Ionia" (τάδ᾽ ἐστὶ Πελοπόννησος, οὐκ Ἰωνία). To the west of the Isthmus is the Gulf of Corinth, to the east the Saronic Gulf. Since 1893 the Corinth Canal has run through the 6.3 km wide isthmus, effectively making the Peloponnese an island. Today, two road bridges, two railway bridges and two submersible bridges at both ends of the canal connect the mainland side of the isthmus with the Peloponnese side. Also a military emergency bridge is located at the west end of the canal.
The idea for a shortcut to save boats sailing all round the Peloponnese was long considered by the Ancient Greeks. The first attempt to build a canal there was carried out by the tyrant Periander in the 7th century BC. He abandoned the project owing to technical difficulties, and instead constructed a simpler and less costly overland stone ramp, named Diolkos, as a portage road. Remnants of Diolkos still exist today next to the modern canal. When the Roman republic (later to be the Roman Empire) took control of Greece, a number of different solutions were tried. Julius Caesar foresaw the advantages of a link for his newly built Colonia Laus Iulia Corinthiensis. By the reign of Tiberius, engineers tried to dig a canal, but were defeated by lack of modern equipment. Instead they built an Ancient Egyptian device: boats were rolled across the isthmus on logs, as the Egyptians had rolled blocks of granite to make their pyramids. This was in use by AD 32. In AD 67, the philhellene Roman emperor Nero ordered 6,000 slaves to dig a canal with spades. According to Pliny the Elder, the work advanced four stadia (about 5/8 kilometers). The following year Nero died, and his successor Galba abandoned the project as being too expensive. In the modern era, the idea was first seriously proposed in 1830, soon after Greece's independence from the Ottoman Empire, and was brought to completion in 1893 after eleven years' work.