The spectacular canal that was 2,500 years in the making
https://edition.cnn.com/travel/article/corinth-canal-greece/index.html
Unlike Suez Canal or Panama Canal, the Corinth Canal is not the canal that can take a shortcut more than 10000km. So, I wonder how many vessels benefit from this canal.
But, I think there won't be a canal that has longer history than Corinth Canal.