The shortest route between the northern Ionian Sea and the Saronic Gulf runs through the Gulf of Patras, the Corinthian Gulf and finally through the Corinthian canal, which stretches over 3.2 miles from the most south-eastern point of the Corinthian Gulf (Posidonia) to the north-western corner of the Saronic Gulf (Isthmia). The canal is 25 metres wide and the maximum draught for ships passing through it is 7 metres. The bluffs into which the canal was carved rise up to 75 metres high.
