The Canal cuts in a straight line the Isthmus of Corinth in length 6.346 m. Its width at the surface of the sea is 24,6 m. and at the bottom it is 21,3 m., while its depth oscillates between 7,50 and 8 m. However, the idiomorphic geological constitution of its flanks had as a consequence a number of major landslides into the Canal at several instances, and as a result it remained close for an extended period of time.

Overall from the beginning of its operation up to 1940, various collapses caused the closure of the Canal for a total of 4 years. The most considerable of these collapses occurred in 1923 when volumes of earth of 41.000 cubic meters had fallen in and kept the canal closed for 2 years.

Furthermore another major interruption of the operation occurred in 1944, and it is owed to the explosion of the flanks which were caused by the retreating German Army that caused 60000 cubic meters of earth to cave in. It took 5 years to clear the Canal for traffic (1944-1949).

Let it be noted that before the explosion, the Germans threw into the Canal an important number of railway vehicles in order to make the repairs even more difficult. This as it was mentioned before, lasted 5 years.

Also, in the Corinth Canal today two submersible bridges function. One is at Posidonia and the other is at Isthmia, in order to serve the communication between Sterea and Peloponnese. Each year 15.000 boats cross roughly the waters of Isthmus, of at least 50 nationalities.