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Sonia Halliday
Crossing the Isthmus of Corinth by boat was a problem first solved in the early sixth century B.C. Periander, ruler of Corinth, proposed building a canal but settled instead for a roadway, which is calked the diolkos. Grooves about 5 feet apart served as tracks for specially built wooden platforms that transported ships between the Saronic Gulf and the Gulf of Corinth.